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
Share:
For working professionals
For fresh graduates
More
By Rohan Vats
Updated on Jun 24, 2025 | 27 min read | 15.32K+ views
Share:
Table of Contents
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.
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 :
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 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.
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
Tools:
Skills Gained:
Examples:
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. |
Source: sourcecodester
Manages student data like grades and attendance, allowing users to input, update, and search for student records.
Tools:
Skills Gained:
Examples:
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. |
Source: UpdateGadh
Manages book records, allowing users to add, search, and delete books from the catalog.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Stores employee details and allows functionalities like adding, searching, and editing records.
Tools:
Skills Gained:
Examples:
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. |
Source: GeeksforGeeks
Simulates a dice-based board game where players navigate a grid with snakes and ladders.
Tools:
Skills Gained:
Examples:
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
Source: source code and projects
Manages customer accounts, allowing balance checks, deposits, withdrawals, and transfers.
Tools:
Skills Gained:
Examples:
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. |
Source: sourcecodester
Manages patient records, appointments, and doctor details for easy access by medical staff.
Tools:
Skills Gained:
Examples:
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. |
Source: Sourcecodester
Enables users to book bus tickets, check availability, and manage reservations.
Tools:
Skills Gained:
Examples:
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. |
Source: Code with C
Tracks live cricket match scores, including runs, wickets, and overs.
Tools:
Skills Gained:
Examples:
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. |
Source: Quora
A word-guessing game where players guess letters to reveal a word.
Tools:
Skills Gained:
Examples:
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
Source: Itsourcecode.com
Performs basic arithmetic operations like addition, subtraction, multiplication, and division.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Allows users to vote and displays real-time results.
Tools:
Skills Gained:
Examples:
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. |
Source: sourcecodester.com
Converts numbers between various bases, such as binary, decimal, and hexadecimal.
Tools:
Skills Gained:
Examples:
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!
Source: GitHub
A multiple-choice quiz game that allows users to answer questions and track scores.
Tools:
Skills Gained:
Examples:
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.
upGrad’s Exclusive Software Development Webinar for you –
SAAS Business – What is So Different?
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.
Source: sourcecodester.com
Automates the billing process for telecom services, tracking customer accounts and call details.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
A classic 3x3 grid game where players take turns to mark cells and aim for three in a row.
Tools:
Skills Gained:
Examples:
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. |
Source: puskarcoding.com
A popular arcade game where the player controls a snake that grows as it eats, avoiding collisions.
Tools:
Skills Gained:
Examples:
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
Source: GitHub
Displays weather data fetched from an API for a given location.
Tools:
Skills Gained:
Examples:
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
Source: GitHub
Recreates the classic arcade game where the player avoids ghosts while eating pellets.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Creates an online store where users can browse products, add them to the cart, and place orders.
Tools:
Skills Gained:
Examples:
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. |
Source: Source Code and Projects
Allows users to view, add, and edit events, integrating with online calendars.
Tools:
Skills Gained:
Examples:
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 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:
Source: sourcecodester.com
A browser-based game where a dinosaur avoids obstacles while running.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Allows real-time messaging between users, incorporating user authentication and message encryption.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Checks source code for syntax errors, automating error-checking and debugging.
Tools:
Skills Gained:
Examples:
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]
Source: GitHub
Allows users to create, edit, and save text documents with features like syntax highlighting.
Tools:
Skills Gained:
Examples:
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
Source: GitHub
Tokenizes source code into a sequence of tokens for use in a compiler.
Tools:
Skills Gained:
Examples:
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. |
Source: GitHub
Simulates a piano keyboard allowing users to play notes by pressing corresponding keys.
Tools:
Skills Gained:
Examples:
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.
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. |
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.
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.
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
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.
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.
Source Code:
1. Rock Paper Scissors Game Source Code
2. School Information System Source Code
3. Library Catalog System Source Code
4. Employee Directory System Source Code
5. Snakes and Ladders Game Source Code
6. Bank Account Management System Source Code
7. Hospital Record System Source Code
8. Bus Booking System Source Code
9. Cricket Score Tracker Source Code
10. Hangman Game Source Code
11. Basic Calculator Source Code
12. Online Polling System Source Code
13. Number Base Converter Source Code
14. Quiz Game App Source Code
15. Telecom Billing Management Source Code
16. Tic-Tac-Toe Game Source Code
17. Classic Snake Game Source Code
18. Weather Forecasting App Source Code
19. Pac-Man Style Game Source Code
20. E-commerce Platform System Source Code
21. Digital Calendar Source Code
22. Dino Game Source Code
23. Chat Application Source Code
24. Syntax Validator Source Code
25. Text Editor Application Source Code
26. Lexical Analyzer Source Code
27. Virtual Piano App Source Code
References:
https://www.inclind.com/news/github-statistics-trends
https://github.blog/news-insights/octoverse/octoverse-2024
408 articles published
Software Engineering Manager @ upGrad. Passionate about building large scale web apps with delightful experiences. In pursuit of transforming engineers into leaders.
Get Free Consultation
By submitting, I accept the T&C and
Privacy Policy
India’s #1 Tech University
Executive PG Certification in AI-Powered Full Stack Development
77%
seats filled
Top Resources