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25+ C Open Source Projects for Freshers and Experts to Excel in 2025

By Rohan Vats

Updated on Jun 24, 2025 | 27 min read | 15.32K+ views

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Did you know? In 2024, GitHub recorded over 3.5 billion contributions to open-source projects, with C being one of the top 500 languages used ! Meanwhile public repositories have also hit 518 million, growing 25% year-over-year. It’s the perfect time to jump into C-based open-source projects and level up your skills!

C Open Source Projects, such as building a lexical analyzer, offer a great way to enhance your C programming skills and contribute to the open-source community. Whether you’re a beginner or expert, these projects provide hands-on experience in systems programming, performance optimization, and debugging.

This blog highlights key projects like a Syntax Validator for code analysis, a Virtual Piano App for UI development, and a Weather Forecasting System for data analysis and API integration. These projects span application development, data processing, and real-time systems, helping you improve coding, problem-solving, and collaboration skills.

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25+ C Open Source Projects Every Programmer Should Try in 2025

Contributing to C open source projects is a great way to enhance your skills, from beginner-level games like Rock Paper Scissors to advanced systems like Chat Applications. 

Projects are categorized by difficulty, allowing you to start small with tasks like file handling and gradually progress to complex systems involving multi-threading and network communication. 

Other notable projects include a Mini Web Server, Text-based RPG, and Image Editor. These projects provide hands-on experience, help build your portfolio, and prepare you for larger, real-world systems.

To advance your programming career and C open source contributions , upGrad’s specialized programs provide in-depth learning and practical experience : 

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Job-Linked Program

Bootcamp36 Weeks

With that in mind, let’s explore some basic C open source projects for beginners that will provide a solid starting point to sharpen your skills.

Basic C Open Source Projects for Beginners

 

Basic C open source projects are a great way for beginners to build a strong foundation in programming. These projects focus on key concepts like user input, file handling, and control structures. 

Projects like Rock Paper Scissors Game, School Information System, and Library Catalog System offer manageable tasks that help improve coding skills and problem-solving abilities, while preparing you for more complex challenges in the future.

1. Rock Paper Scissors Game

A simple game where players choose rock, paper, or scissors, and the computer randomly selects one. The winner is determined based on the game’s rules.

 

Source: GitHub

  • Prerequisites: Basic understanding of loops, conditionals, and random number generation in C.
  • How This Project Solves the Problem: It demonstrates how to handle user inputs, implement game logic, and introduce randomness in a fun, interactive setting.

Tools:

  • C
  • Libraries: stdio.h for input/output, stdlib.h for random number generation.

Skills Gained:

  • User input handling: Using scanf() to take user inputs.
  • Random number generator: Understanding and applying random number generation with rand().
  • Control structures: Learning how to use if-else or switch-case statements to implement game logic.

Examples:

  • Game development: Provides a foundation for more complex game logic and user interaction.
  • Decision-making applications: The structure of this game can be adapted for applications that require decision-making processes or simulations.

Challenges and Solutions: 

Challenge

Solution

Handling invalid inputs Implement input validation to ensure the user enters only valid choices (rock, paper, scissors).
Enhancing AI decision-making Introduce algorithms that allow the computer to predict and adapt to player behavior.

2. School Information System

 

Source: sourcecodester

Manages student data like grades and attendance, allowing users to input, update, and search for student records.

  • Prerequisites: Knowledge of arrays, structs, and file handling.
  • How This Project Solves the Problem: It enables teachers and administrators to maintain accurate records and easily access relevant student information when needed.

Tools:

  • C
  • File handling functions (fopen(), fscanf(), fprintf()) for storing student data on disk.
  • Structs for managing student details (e.g., name, roll number, grade).

Skills Gained:

  • Data structures: Understanding how to use arrays and structs to manage multiple data fields.
  • File handling: Reading and writing data to files for persistent storage.
  • Search algorithms: Implementing basic search techniques to retrieve student records based on search criteria.

Examples:

  • Student management software: This project can be adapted for use in schools and universities for managing student records.
  • Administrative systems: Can be expanded to track staff or course information for educational institutions.

Challenges and Solutions: 

Challenge

Solution

Generating reports for students Implement functions that automatically generate performance reports based on grades and attendance.
Improving search efficiency Use advanced data structures like binary search trees or hash tables for faster searching.

3. Library Catalog System

 

Source: UpdateGadh

Manages book records, allowing users to add, search, and delete books from the catalog.

  • Prerequisites: Basic knowledge of arrays, strings, and file handling in C.
  • How This Project Solves the Problem: The system helps store and retrieve data about books efficiently, eliminating the need for paper-based cataloging.

Tools:

  • C
  • File handling for data persistence.
  • Arrays and strings to manage and store book titles, authors, etc.

Skills Gained:

  • Data management: Storing, retrieving, and updating data using arrays and files.
  • String manipulation: Working with string functions to process book titles and authors.
  • Memory management: Handling dynamic arrays and ensuring efficient memory usage in larger systems.

Examples:

  • Library management systems: Could be expanded into more complex software used in educational institutions and libraries.
  • Inventory systems: Similar principles can be applied to any inventory management system, like a bookstore or digital content library.

Challenges and Solutions: 

Challenge

Solution

Implementing advanced search Add search filters such as by genre, publication year, or author for more efficient lookups.
Managing large catalog data Use dynamic memory allocation and linked lists for more scalable storage.

4. Employee Directory System

 

Source: GitHub

Stores employee details and allows functionalities like adding, searching, and editing records.

  • Prerequisites: Understanding arrays, structs, and basic file handling.
  • How This Project Solves the Problem: The directory makes it easy to manage and update employee information, allowing HR departments or team leaders to quickly find employee details.

Tools:

  • C
  • File handling for storing employee data in files.
  • Structs to group employee-related data.

Skills Gained:

  • Data organization: Using structs and arrays for more efficient data management.
  • Search algorithms: Implementing methods to search for employees by various fields (e.g., department, name).
  • File I/O: Handling files for saving and loading employee records.

Examples:

  • HR management systems: This system could easily be expanded into a complete employee management tool used by HR departments.
  • Business contact directories: Can be used to create digital contact books for organizations or teams.

Challenges and Solutions: 

Challenge

Solution

Searching employee records Implement a more efficient search algorithm such as binary search or hash maps for quicker lookups.
Handling large datasets Use dynamic data structures like linked lists for scalable storage of employee records.

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5. Snakes and Ladders Game

 

Source: GeeksforGeeks

Simulates a dice-based board game where players navigate a grid with snakes and ladders.

  • Prerequisites: Understanding of loops, arrays, random number generation, and basic game logic in C.
  • How This Project Solves the Problem: It simulates the traditional board game mechanics in a text-based format, providing an opportunity to practice randomness and user interaction.

Tools:

  • C
  • Libraries: stdio.h, stdlib.h for input/output and random number generation.

Skills Gained:

  • Random number generation using rand() to simulate dice rolls.
  • Control flow with if-else statements for game rules and decision making.
  • User input handling using scanf() to take player moves.

Examples:

  • Game development: This project lays the foundation for creating other board games or even interactive simulations.
  • Interactive decision systems: Could be adapted for use in training simulators or educational games.

Challenges and Solutions: 

Challenge

Solution

Adding multiplayer functionality Implement a system where two players can alternate turns in the game.
Enhancing the AI for single-player mode Implement an AI that uses strategies to make the computer’s moves more challenging for the player.

Also Read: Data Types in C and C++ Explained for Beginners

6. Bank Account Management System

 

Source: source code and projects

Manages customer accounts, allowing balance checks, deposits, withdrawals, and transfers.

  • Prerequisites: Familiarity with structs, functions, file handling, and arrays in C.
  • How This Project Solves the Problem: It simplifies and automates common banking transactions, helping practice data storage, transactions, and security in a basic banking context.

Tools:

  • C
  • File handling for transaction logs (fopen, fwrite).
  • Arrays and structs to store account information.

Skills Gained:

  • File I/O operations for saving and retrieving account data.
  • Data structure management using structs to group related information (e.g., balance, account number).
  • Transaction handling: Implementing withdrawal, deposit, and transfer logic.

Examples:

  • Banking systems: Building applications for small banks or micro-financing institutions.
  • Financial services: This project can be expanded to handle loan applications, interest calculation, etc.

Challenges and Solutions: 

Challenge

Solution

Ensuring security Implement password protection and PIN verification for secure account access.
Supporting multiple account types Expand the system to support different account types, such as savings, current, or loan accounts.

7. Hospital Record System

 

Source: sourcecodester

Manages patient records, appointments, and doctor details for easy access by medical staff.

  • Prerequisites: Understanding of structs, arrays, file handling, and search algorithms in C.
  • How This Project Solves the Problem: It organizes patient data, making it easily accessible for hospital staff. This system helps in keeping track of important patient details like medical history, prescriptions, and appointments.

Tools:

  • File handling for saving patient records.
  • Arrays and structs for managing data.

Skills Gained:

  • Data management using arrays and structs.
  • Efficient searching for patient records using algorithms.
  • Data persistence through file handling.

Examples:

  • Healthcare management systems: Building software for hospitals, clinics, or small healthcare providers.
  • Medical software applications: Extending the project to track medical inventory, appointment scheduling, etc.

Challenges and Solutions: 

Challenge

Solution

Securing patient data Implement encryption methods to secure sensitive patient information.
Adding appointment scheduling Integrate a calendar system for managing patient appointments and doctor availability.

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8. Bus Booking System

 

Source: Sourcecodester

Enables users to book bus tickets, check availability, and manage reservations.

  • Prerequisites: Familiarity with arrays, file handling, and basic user input/output in C.
  • How This Project Solves the Problem: It automates the process of booking bus tickets, providing users with a way to check seat availability and book tickets online.

Tools:

  • C
  • File handling to store booking data and availability.

Skills Gained:

  • Data management using arrays for seat availability.
  • File I/O to persist booking details.
  • User input handling to allow ticket reservations.

Examples:

  • Transportation systems: This project simulates ticketing systems used in various modes of transport.
  • Event booking systems: Similar concepts can be applied to book tickets for concerts, conferences, etc.

Challenges and Solutions: 

Challenge

Solution

Managing real-time seat availability Use algorithms that track and update seat availability dynamically.
Payment integration Integrate an online payment gateway for ticket booking.

9. Cricket Score Tracker

 

Source: Code with C

Tracks live cricket match scores, including runs, wickets, and overs.

  • Prerequisites: Basic knowledge of arrays, loops, and user input in C.
  • How This Project Solves the Problem: It simplifies the process of recording match data and provides real-time updates on scores and statistics.

Tools:

  • C
  • Arrays and structs for managing teams, players, and scores.

Skills Gained:

  • Data tracking using arrays and structs.
  • Real-time user interaction and score updates.
  • Basic event-driven programming.

Examples:

  • Sports tracking apps: Can be used in building apps to track live scores for various sports.
  • Sports analytics systems: For analyzing players’ performance based on live match data.

Challenges and Solutions: 

Challenge

Solution

Adding real-time updates Use real-time data input and update the score dynamically during a live match.
Managing multiple matches Extend the system to track scores for multiple matches simultaneously.

10. Hangman Game

 

Source: Quora

A word-guessing game where players guess letters to reveal a word.

  • Prerequisites: Knowledge of arrays, strings, and loops.
  • How This Project Solves the Problem: The game’s logic involves string manipulation to check user input against the word to be guessed.

Tools:

  • C
  • Standard libraries for input/output and string manipulation.

Skills Gained:

  • String handling: Working with character arrays and manipulating strings in C.
  • Game logic development using loops and conditionals.
  • User input handling for guessing letters.

Examples:

  • Game development: Simple games like Hangman help build fundamental coding skills for game development.
  • User interaction systems: Can be adapted for any game that requires user input and feedback.

Challenges and Solutions: 

Challenge

Solution

Handling multiple players Implement multiplayer functionality where more than one player can participate in the game.
Adding difficulty levels Introduce difficulty levels by adjusting the length or complexity of words to guess.

Also Read: Common String Functions in C with Examples

11. Basic Calculator

 

Source: Itsourcecode.com

Performs basic arithmetic operations like addition, subtraction, multiplication, and division.

  • Prerequisites: Familiarity with functions, switch statements, and basic arithmetic operations.
  • How This Project Solves the Problem: The calculator offers an interactive way to perform basic arithmetic, simulating a real-world tool in software form.

Tools:

  • C
  • Switch-case statements for selecting operations.

Skills Gained:

  • Function implementation for performing operations.
  • Control flow handling using switch-case for operations.
  • User input processing with scanf().

Examples:

  • Financial software: Can be expanded to perform more complex calculations for accounting or tax software.
  • Utility applications: Useful as the basis for other small tools or apps.

Challenges and Solutions: 

Challenge

Solution

Adding advanced mathematical functions Implement additional operations like square roots, trigonometric functions, and powers.
Providing a user-friendly interface Develop a simple graphical user interface (GUI) for better user interaction.

12. Online Polling System

 

Source: GitHub

Allows users to vote and displays real-time results.

  • Prerequisites: Understanding arrays, file handling, and basic data structures.
  • How This Project Solves the Problem: It automates the process of collecting and tallying votes, making it easier to gather public opinions on various topics.

Tools:

  • C
  • File handling for saving poll data.
  • Arrays for storing vote counts.

Skills Gained:

  • Data collection and real-time updates using arrays and files.
  • Basic statistical analysis for tallying votes.

Examples:

  • Event voting systems: Can be adapted for live event polls or surveys.
  • Market research tools for collecting and analyzing feedback.

Challenges and Solutions: 

Challenge

Solution

Preventing multiple votes from the same user Implement a system that detects and prevents duplicate votes from the same IP or user.
Adding cybersecurity features Implement CAPTCHA or email-based verification to ensure one vote per person.

13. Number Base Converter

 

Source: sourcecodester.com

Converts numbers between various bases, such as binary, decimal, and hexadecimal.

  • Prerequisites: Understanding of number systems, loops, and mathematical operations in C.
  • How This Project Solves the Problem: It automates base conversions, making it easier for users to understand and perform conversions between number systems.

Tools:

  • C
  • Loops and functions to handle conversions.

Skills Gained:

  • Understanding of number systems (binary, octal, decimal, hexadecimal).
  • Implementing algorithms for number base conversion.
  • Mathematical operations to convert numbers between systems.

Examples:

  • Computer architecture: Understanding binary and hexadecimal conversions is fundamental in low-level programming and system design.
  • Data analysis tools: Similar concepts can be used to convert or visualize data in different formats.

Challenges and Solutions: 

Challenge

Solution

Handling large numbers Implement algorithms that support large number conversions efficiently.
Adding more base systems Extend the converter to handle more complex number systems (e.g., base-64 or floating-point).

Also Read: Data Visualisation: The What, The Why, and The How!

14. Quiz Game App

 

Source: GitHub

A multiple-choice quiz game that allows users to answer questions and track scores.

  • Prerequisites: Familiarity with arrays, strings, and loops in C.
  • How This Project Solves the Problem: It helps users learn while testing their knowledge on various subjects, providing an interactive way to engage with content.

Tools:

  • C
  • Arrays and strings to store questions, options, and answers.

Skills Gained:

  • Array handling for storing multiple-choice questions and answers.
  • Control flow for managing quiz logic.
  • User interaction through input handling.

Examples:

  • Educational software: This project could serve as the foundation for educational quizzes in e-learning apps.
  • Customer feedback systems: Similar structures could be used for survey apps or polling systems.

Challenges and Solutions: 

Challenge

Solution

Adding more interactive elements Include multimedia questions, such as images or videos, to make the quiz more engaging.
Expanding user engagement Implement a scoring system, time limits, and a leaderboard to boost competition.

Once you’ve mastered basic C open-source projects, transitioning to intermediate projects becomes a natural next step. These projects help you deepen your knowledge by introducing more advanced concepts, such as complex data structures, algorithms, and interactions with external systems. 

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Intermediate C Open Source Projects to Level Up Your Skills

 

Intermediate C open source projects offer a step up in complexity, helping you deepen your understanding of data structures, algorithms, and multi-threading. Projects like Tic-Tac-Toe Game, Bank Account Management System, and Cricket Score Tracker introduce more advanced concepts such as dynamic memory allocation, file handling, and real-time updates. 

These projects provide opportunities to refine your coding practices, improve problem-solving skills, and prepare for more intricate systems as you continue to grow as a developer.

15. Telecom Billing Management

 

Source: sourcecodester.com

Automates the billing process for telecom services, tracking customer accounts and call details.

  • Prerequisites: Strong understanding of structs, file handling, and arrays.
  • How This Project Solves the Problem: It streamlines the telecom billing process, making it easier for both users and businesses to manage customer billing details efficiently.

Tools:

  • C
  • File handling for saving customer billing data.
  • Arrays and structs to manage customer and usage data.

Skills Gained:

  • Data storage and management using file systems.
  • Calculations involving customer usage, rate plans, and discounts.
  • Designing billing systems with multiple service charges.

Examples:

  • Telecommunications companies: This project mimics real-world billing systems used by mobile carriers and internet service providers.
  • Utility billing systems: Can be adapted for other service providers like gas or electricity companies.

Challenges and Solutions: 

Challenge

Solution

Securing user data Implement encryption and secure access to customer information and billing details.
Handling multiple currencies Implement support for billing in multiple currencies with automatic conversion rates.

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16. Tic-Tac-Toe Game

 

Source: GitHub

A classic 3x3 grid game where players take turns to mark cells and aim for three in a row.

  • Prerequisites: Knowledge of arrays, loops, and functions.
  • How This Project Solves the Problem: This project introduces basic game mechanics and allows for turn-based player interactions, making it a good practice for implementing game logic.

Tools:

  • C
  • Arrays for the game board structure.
  • Functions to handle game logic and check for a winner.

Skills Gained:

  • Arrays manipulation: For the 3x3 board.
  • Game logic: Implementing the rules of Tic-Tac-Toe, including win conditions and player turns.
  • Basic AI: Developing a computer opponent that uses a simple strategy.

Examples:

  • Game development: Laying the groundwork for building more complex turn-based games.
  • AI logic implementation: This can be extended to more sophisticated AI in gaming or decision-making systems.

Challenges and Solutions: 

Challenge

Solution

Enhancing AI logic Improve the AI by implementing more advanced algorithms like minimax for better performance.
Adding multiplayer functionality Extend the game to allow online multiplayer, enabling users to compete with others remotely.

17. Classic Snake Game

 

Source: puskarcoding.com

A popular arcade game where the player controls a snake that grows as it eats, avoiding collisions.

  • Prerequisites: Basic understanding of arrays, game loops, and keyboard input.
  • How This Project Solves the Problem: It teaches game development basics and helps beginners practice game loop mechanics and collision detection.

Tools:

  • C
  • Libraries: ncurses (on Unix/Linux) or conio.h (on Windows) for handling user input and screen drawing.

Skills Gained:

  • Collision detection for ensuring the snake doesn’t run into itself or the walls.
  • Game loop management to continuously update the game state and handle user input.
  • Screen rendering and updating to show the snake’s movements.

Examples:

  • Mobile games: Similar games like “Slither.io” and other snake-based games use these same principles.
  • Game development: Provides foundational knowledge for creating more complex, real-time games.

Challenges and Solutions: 

Challenge

Solution

Adding advanced game mechanics Introduce new challenges, such as obstacles or time limits, to increase game complexity.
Porting to mobile Adapt the game for mobile devices with touch input controls and mobile-friendly UI.

Also Read: 12 Best UI UX Designer Tools: Choosing the Right Software for Your Projects

18. Weather Forecasting App

 

Source: GitHub

Displays weather data fetched from an API for a given location.

  • Prerequisites: Familiarity with API integration, JSON parsing, and file handling.
  • How This Project Solves the Problem: It demonstrates how to integrate external data and how to parse and display real-time weather information.

Tools:

  • C
  • CURL library for making HTTP requests to external APIs.
  • JSON parsing libraries (like jansson) for handling data from APIs.

Skills Gained:

  • API integration: Fetching and processing data from a third-party source.
  • Data parsing: Understanding and working with JSON to extract relevant weather information.
  • User interface: Displaying dynamic data based on user input.

Examples:

  • Weather apps: Similar systems power real-time weather forecasting apps available on mobile devices.
  • Data-driven applications: Learning to integrate external data sources into apps for a more dynamic user experience.

Challenges and Solutions: 

Challenge

Solution

Handling API failures Implement robust error handling to manage API outages or incorrect data from the weather service.
Adding more detailed forecasts Extend the system to provide forecasts for different weather parameters, such as precipitation or wind speed.

Also Read: How to Open JSON File? A Complete Guide to Creating and Managing JSON Files

19. Pac-Man Style Game

 

Source: GitHub

Recreates the classic arcade game where the player avoids ghosts while eating pellets.

  • Prerequisites: Understanding of game mechanics, collision detection, and basic AI.
  • How This Project Solves the Problem: It offers an engaging environment to practice AI algorithms, user input handling, and game state management.

Tools:

  • C
  • Libraries: SDL2 for rendering and user input handling.

Skills Gained:

  • AI development for ghost movement.
  • Game state management (managing multiple levels, lives, and score systems).
  • Graphics handling to render the game board and characters.

Examples:

  • Game development: Similar principles can be applied to other arcade games or platformers.
  • AI pathfinding: Algorithms like A or BFS* for intelligent NPC movement.

Challenges and Solutions: 

Challenge

Solution

Improving AI for ghost behavior Use pathfinding algorithms like A* to make ghost movements more intelligent.
Enhancing visuals Introduce smooth animations and color transitions to make the game more visually appealing.

20. E-commerce Platform System

 

Source: GitHub

Creates an online store where users can browse products, add them to the cart, and place orders.

  • Prerequisites: Understanding of data structures, database management, and web development basics.
  • How This Project Solves the Problem: This system simulates the core features of an online store, including catalog management, order tracking, and payment systems.

Tools:

  • C
  • SQL or SQLite for database management.
  • Socket programming for network communication.

Skills Gained:

  • Database management: Storing and querying product and user data.
  • E-commerce logic: Implementing cart functionality, user authentication, and order management.
  • Network programming: Enabling communication between the server and clients.

Examples:

  • E-commerce websites: Building scalable e-commerce platforms that handle user requests and transactions.
  • Online marketplaces: Similar systems power large marketplaces like Amazon and eBay.

Challenges and Solutions: 

Challenge

Solution

Integrating payment gateways Implement a secure payment gateway for processing transactions and user authentication.
Enhancing user experience Design a more intuitive and user-friendly interface, with an easy navigation flow.

Gain a solid foundation in database design with upGrad's free Introduction to Database Design with MySQL course. Learn how to integrate databases effectively using C programming to create robust systems.

21. Digital Calendar

 

Source: Source Code and Projects

Allows users to view, add, and edit events, integrating with online calendars.

  • Prerequisites: Understanding of linked lists, structs, and file handling.
  • How This Project Solves the Problem: It provides an easy way to manage daily activities and deadlines, simulating a real-world calendar app with additional functionalities.

Tools:

Skills Gained:

  • Memory management using linked lists for efficient event storage.
  • User input handling for creating and editing events.
  • Calendar logic for displaying events and reminders.

Examples:

  • Event management software: Similar applications help users manage appointments, meetings, and schedules.
  • Productivity apps: Can be extended to include tasks, notifications, and reminders.

Challenges and Solutions: 

Challenge

Solution

Synchronization with external calendars Integrate the system with Google Calendar or other third-party services to sync events.
Managing recurring events Implement features to allow users to set and manage recurring events like weekly meetings.

With intermediate-level projects under your belt, you’re ready to take on advanced challenges that involve deeper problem-solving and system-level programming. These projects will require mastery of more complex algorithms, multi-threading, and real-time data processing.

Advanced C Open Source Projects for Aspiring Professionals

 

Advanced C open source projects push your skills further, tackling complex algorithms, system-level programming, and real-time data processing. Projects like Chat Application, E-commerce Platform System, and Virtual Piano App challenge you with network communication, performance optimization, and user interface development. 

These projects offer deep insights into software architecture and help you prepare for large-scale systems in professional environments. Let’s explore these further: 

22. Dino Game

 

Source: sourcecodester.com

A browser-based game where a dinosaur avoids obstacles while running.

  • Prerequisites: Strong understanding of game development, event handling, and graphic rendering in C.
  • How This Project Solves the Problem: It enhances game development skills while focusing on real-time interaction, collision detection, and game logic.

Tools:

  • C
  • SDL2 (Simple DirectMedia Layer) for graphics rendering and event handling.
  • Libraries: SDL.h for graphical elements.

Skills Gained:

  • Real-time event handling using game loops.
  • Collision detection algorithms for game objects (obstacles).
  • Graphics rendering using SDL2 to handle visual elements.

Examples:

  • Browser-based games: Similar logic is used in many web-based games like Flappy Bird or Pong.
  • Interactive software: This can be adapted for real-time simulations or educational tools.

Challenges and Solutions: 

Challenge

Solution

Improving obstacle AI Implement dynamic obstacle behavior that changes based on the player's performance.
Multiplayer support Add a multiplayer feature where players can compete against each other in real-time.

Master the fundamentals of AI with upGrad's free Artificial Intelligence in the Real World course. Learn how to implement AI techniques in C programming for real-world applications.

23. Chat Application

 

Source: GitHub

Allows real-time messaging between users, incorporating user authentication and message encryption.

  • Prerequisites: Understanding of sockets, multithreading, and network communication.
  • How This Project Solves the Problem: It provides hands-on experience with creating real-time communication tools and managing network traffic.

Tools:

  • C
  • Sockets for communication between client and server.
  • pthread for handling multiple users simultaneously.

Skills Gained:

  • Network programming using sockets for client-server communication.
  • Concurrency with multithreading for handling multiple clients.
  • Message encryption to ensure secure communication.

Examples:

  • Messaging apps: Similar architectures are used by messaging platforms like WhatsApp or Slack.
  • Customer support systems: Real-time messaging systems are often integrated into live chat tools for businesses.

Challenges and Solutions: 

Challenge

Solution

Ensuring real-time messaging Use WebSockets or similar technology to enable real-time communication between users.
Adding message encryption Implement end-to-end encryption for message security and privacy.

24. Syntax Validator

 

Source: GitHub

Checks source code for syntax errors, automating error-checking and debugging.

  • Prerequisites: Knowledge of lexical analysis, regular expressions, and file parsing.
  • How This Project Solves the Problem: It automates the process of syntax validation for code written in a programming language, making it more efficient for developers.

Tools:

  • C
  • Lexical analysis libraries (like Flex) for tokenizing code.
  • Regular expressions for pattern matching and validation.

Skills Gained:

  • Lexical analysis for breaking code into manageable tokens.
  • Regular expressions for pattern matching and error checking.
  • File parsing to read and process source code.

Examples:

  • Code editors: Syntax checkers are built into IDEs like Visual Studio Code or Eclipse.
  • Compilers: Syntax validation is a core part of the compilation process in software development.

Challenges and Solutions: 

Challenge

Solution

Supporting multiple languages Extend the validator to support different programming languages by adding language-specific parsing rules.
Optimizing for large files Implement efficient algorithms to process large code files without affecting performance.

Also Read: How To Create Dynamic Web Project Using Eclipse [Step By Step Explanation]

25. Text Editor Application

 

Source: GitHub

Allows users to create, edit, and save text documents with features like syntax highlighting.

  • Prerequisites: Familiarity with file handling, UI design, and text processing in C.
  • How This Project Solves the Problem: This project demonstrates how to build a basic text editor with essential features for programming or document editing.

Tools:

  • C
  • ncurses (or GTK) for building the user interface.
  • File I/O for reading and saving files.

Skills Gained:

  • Text parsing for operations like find and replace.
  • UI/UX design using libraries like ncurses or GTK.
  • File handling to save and open text files.

Examples:

  • Code editors: Editors like Sublime Text or Notepad++ use similar principles.
  • Document management systems: The same architecture can be used for enterprise document management systems.

Challenges and Solutions: 

Challenge

Solution

Implementing syntax highlighting Use regular expressions and language-specific patterns to highlight keywords, functions, and comments.
Cross-platform compatibility Port the application to work on different operating systems like Windows, Linux, and macOS.

Also Read: UI vs. UX Design in 2025: Key Differences, Similarities, and How They Impact User Experience

26. Lexical Analyzer

 

Source: GitHub

Tokenizes source code into a sequence of tokens for use in a compiler.

  • Prerequisites: Understanding of lexical analysis, regular expressions, and state machines.
  • How This Project Solves the Problem: It automates the process of identifying and extracting tokens from source code, making it easier to pass data to the parser.

Tools:

  • C
  • Flex for lexical analysis.
  • Bison or Yacc for parser generation.

Skills Gained:

  • Tokenizing input: Breaking code into valid symbols.
  • Regular expressions for pattern matching and filtering input.
  • Understanding compilers: This project provides a good introduction to how compilers process code.

Examples:

  • Compiler design: This is a core component of any compiler or interpreter.
  • Custom scripting languages: Used for building scripting or query languages in software.

Challenges and Solutions: 

Challenge

Solution

Supporting complex languages Extend the lexer to handle custom programming languages or complex grammar structures.
Error reporting Implement more informative error messages that guide users on fixing syntax errors.

27. Virtual Piano App

 

Source: GitHub

Simulates a piano keyboard allowing users to play notes by pressing corresponding keys.

  • Prerequisites: Familiarity with event handling, sound libraries, and real-time systems.
  • How This Project Solves the Problem: It provides an interactive platform for users to learn or enjoy playing music, while practicing event-driven programming.

Tools:

  • C
  • SDL2 or ALSA (Advanced Linux Sound Architecture) for sound handling.
  • Event handling for key press detection.

Skills Gained:

  • Event-driven programming for detecting user input.
  • Audio management using libraries like SDL2 or ALSA.
  • Real-time systems to process input immediately and produce sound.

Examples:

  • Music apps: Similar to apps like GarageBand or online piano tools.
  • Sound-based simulations: Used in educational tools for learning musical instruments.

Challenges and Solutions: 

Challenge

Solution

Adding multi-instrument support Extend the app to include different instruments, such as drums or guitar, alongside the piano.
Expanding to mobile platforms Port the app to mobile devices, adding features like multi-touch support for playing multiple keys.

Also Read: Top 20 Highest Paying CS Salary Jobs in India for 2025

Now that you’ve explored various C open source projects, focus on those that align with your skills to apply and challenge your knowledge. Incorporating best practices in coding and project management will ensure efficient, scalable growth.

How to Select the Best Open Source Projects on C to Enhance Your Skills?

Contributing to open source C projects lets you apply your skills to real-world challenges, collaborate with developers, and deepen your understanding of memory allocation, optimization, and multi-threading. 

To make impactful contributions, it’s key to follow best practices like coding standards, performance optimization, and robust testing. Here’s a guide to help you select the right projects and contribute effectively:

Best Practice

Key Insight

Start with clear, simple tasks Begin by tackling “good first issues” or simple bugs that require minimal context, allowing you to gain familiarity with the codebase without feeling overwhelmed.
Thoroughly read documentation Before contributing, read through the project’s README, coding standards, contribution guidelines, and past issues to understand how the project works and its objectives.
Use version control effectively Commit your changes frequently with meaningful, descriptive commit messages. Use branches to keep your changes isolated, and regularly pull the latest updates from the main repository.
Follow project coding standards Adhere strictly to the coding conventions of the project. This might include specific formatting, function naming, or indentation styles to ensure code consistency.
Test your changes Test your changes locally before submitting them to ensure that they work as expected and don’t introduce new bugs. Automated tests are a great way to verify changes.
Engage with the community Join project discussions, forums, or chat rooms (e.g., Slack, Discord) to build relationships, ask questions, and offer feedback on others' contributions.
Be patient with feedback open sourcecontributions are collaborative. If you receive feedback or suggestions for changes, take time to make adjustments and learn from the critique.
Ensure backward compatibility When adding new features, make sure they don’t break existing functionality or compatibility with older versions of the code.
Provide thorough documentation If your contribution affects the user or developer experience, update the documentation or add new comments to clarify how your changes work.

Become a pro in cloud computing and DevOps with industry-led training and hands-on projects. Learn automation, cloud infrastructure, and best practices to tackle real-world challenges. Join the Professional Certificate Program in Cloud Computing and DevOps  today and enhance your contributions to large-scale C projects involving cloud and DevOps practices.

Also Read: 25 Most Common C Interview Questions & Answers [For Freshers]

Even with best practices, challenges like code conflicts and complex codebases may arise. Being aware of these obstacles helps you navigate and resolve them effectively.

Common Challenges in Contributing to C Open Source Projects

Contributing to C open source projects is a rewarding experience, but it comes with challenges. You may face obstacles such as understanding legacy code, managing merge conflicts, and ensuring backward compatibility. open source projects often involve collaboration with developers of varying skill levels, requiring you to adapt to community dynamics and project standards. 

Being aware of these challenges and how to address them will help you make valuable contributions and grow as a developer. Below are some common challenges and solutions to overcome them.

Challenge

Description

Solution

Code Conflicts Modifying the same code section may lead to merge conflicts, delaying progress. Learn git merge and git rebase to handle conflicts. Sync your branch regularly and submit smaller PRs for easier conflict resolution.
Understanding Complex Codebases Large codebases can be overwhelming, especially for beginners. Read project documentation and explore issues. Start with small tasks and ask for help from experienced contributors.
Maintaining Consistency Ensuring your contributions match the project's coding style. Review coding guidelines, use linters to check naming conventions, indentation, and style before submitting.
Limited Feedback Slow feedback from maintainers can delay contributions. Be patient, engage with the community, and submit smaller, well-documented PRs to expedite the review process.
Handling Performance Issues Optimizing performance in large datasets or real-time processing. Profile the app with tools like gprof or valgrind, focus on memory management, and optimize algorithms.
Testing and Validation Ensuring changes don’t break existing functionality. Write unit tests, run automated tools, and validate changes locally before submitting.
Managing Multiple Dependencies Handling differing library versions or dependencies. Use dependency management tools like pkg-config or Docker. Keep dependencies up to date and document version requirements.
Ensuring Security Addressing security vulnerabilities in user data or APIs. Implement input validation, encryption, and secure coding practices. Participate in security audits.
Maintaining Documentation Keeping documentation current with new changes. Regularly update documentation, ensure clarity, and fix outdated content as you contribute.

After discussing the challenges in contributing to C open-source projects, it's important to understand the factors that make these contributions valuable. Let’s explore why contributing to C open-source projects is so crucial.

Benefits of Contributing to C Open Source Projects for Beginners and Experts

Contributing to C open source projects helps beginners improve coding skills, gain real-world experience, and build a developer portfolio. Experts can refine advanced skills, collaborate with peers, stay updated with trends, and enhance their reputation. Both groups benefit from learning best practices, networking, and solving challenging problems.

Some of the major benefits include: 

Benefit

Description

Practical Experience Beginners apply theoretical knowledge to real-world problems, building confidence and improving skills.
Collaborative Learning Contributing exposes beginners to different coding techniques and methodologies by working with experienced developers.
Portfolio Building Contributions to notable open-source projects add value to a developer's portfolio, showcasing their skills.
Networking Opportunities Engaging with the open-source community allows beginners to connect with other developers and explore job opportunities.
Exposure to Industry Best Practices Contributing to established projects introduces beginners to industry best practices, such as coding standards and testing.
Boosting Employability Open-source contributions highlight initiative and problem-solving skills, making beginners more appealing to employers.
Learning Soft Skills Working in teams helps beginners develop important soft skills, including communication, collaboration, and time management.

Also Read: Hard Skills vs Soft Skills: Key Differences Explained

Gain expertise in business analytics and strategy through this course with PwC India. With live sessions, mentorship, and real-world projects, you’ll develop skills that help you make data-driven decisions. Sign up for the Business Analytics & Consulting Course and boost your ability to contribute to C-based projects requiring solid analytics and strategic insights.

To support your journey and maximize your growth, upGrad offers help that will help you excel in C open-source projects and reach your full potential.

How upGrad Supports Your Growth with C Open Source Projects?

These key C open source projects, like the Bus Booking System and Hangman Game, offer hands-on experience in database management and user interface design. Tools like the Linux Kernel, Git, and SQLite allow you to gain hands-on experience in system-level programming, version control, and database optimization. 

Start with smaller, well-documented projects, fix bugs, or improve documentation to build your skills. These contributions help enhance problem-solving abilities and real-world application experience.

Contributing to open-source projects can be challenging without proper guidance. upGrad’s technical courses provide practical experience and expert support, helping you fill skill gaps and advance your career. 

Explore these programs (including free courses) to enhance your programming skills:

Starting a career in C programming and open-source contributions can be overwhelming without the right support. With upGrad, you gain expert guidance, career-oriented training, and access to offline centers for personalized career advice and assistance in navigating your professional path.

Boost your career with our popular Software Engineering courses, offering hands-on training and expert guidance to turn you into a skilled software developer.

Master in-demand Software Development skills like coding, system design, DevOps, and agile methodologies to excel in today’s competitive tech industry.

Stay informed with our widely-read Software Development articles, covering everything from coding techniques to the latest advancements in software engineering.


References: 
https://www.inclind.com/news/github-statistics-trends
https://github.blog/news-insights/octoverse/octoverse-2024

Frequently Asked Questions

1. How can C open source projects help me learn multi-threading and concurrency?

2. Can I contribute to C open source projects if I'm new to system-level programming?

3. What are some C open source projects where I can practice optimization techniques?

4. How can I use C open source projects to improve my understanding of network programming?

5. Are there any C open source projects that focus on developing graphical user interfaces (GUIs)?

6. How can contributing to C open source projects help with learning data structures and algorithms?

7. Can contributing to C open source projects help with understanding operating systems?

8. How can I contribute to C open source projects focused on security?

9. How do C open source projects help me build a professional developer portfolio?

10. How can C open source projects improve my debugging and problem-solving skills?

11. How can contributing to C open source projects improve my collaboration and communication skills?

Rohan Vats

408 articles published

Software Engineering Manager @ upGrad. Passionate about building large scale web apps with delightful experiences. In pursuit of transforming engineers into leaders.

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