C# is a versatile, object-oriented programming language developed by Microsoft as part of the .NET framework. It is designed to be simple and easy to use, promoting strong type-checking and a rich set of libraries, making it ideal for developing a wide range of applications, from desktop to mobile to web-based solutions. C# supports modern programming paradigms, including asynchronous programming, which enhances performance in applications with high I/O operations. Its integration with the .NET ecosystem provides robust tools, such as Visual Studio, for debugging and deployment. Additionally, C# is continually evolving, with frequent updates that introduce new features and improvements, such as records, pattern matching, and nullable reference types, ensuring that developers can write clean, efficient, and maintainable code. Whether you're building enterprise-level software, video games with Unity, or cloud services, C# offers a powerful and flexible platform for application development.
View the most prominent open source C# projects in the list below. Click on a specific project to view its alternative or complementary packages. Make comparisons and find the best package for your app.
Popular C# repositories:
- The Free Software Media System - Server Backend & API☆55,007Updated this week
- A modern file manager that helps users organize their files and folders.☆44,439Updated this week
- ShareX is a free and open-source application that enables users to capture or record any area of their screen with a single keystroke. It…☆38,826Updated this week
- 🔥LeetCode solutions in any programming language | 多种编程语言实现 LeetCode、《剑指 Offer（第 2 版）》、《程序员面试金典（第 6 版）》题解☆36,368Updated this week
- A Swiss Army knife for developers.☆31,804Feb 25, 2026Updated 5 months ago
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI☆31,229Updated this week
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆30,992Jul 1, 2026Updated 3 weeks ago
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆26,289Jul 17, 2026Updated last week
- Pulumi - Infrastructure as Code in any programming language 🚀☆25,484Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆25,218Mar 22, 2026Updated 4 months ago
- A collection of awesome .NET libraries, tools, frameworks and software☆21,512Mar 26, 2026Updated 4 months ago
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,343Feb 27, 2026Updated 5 months ago
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,571Updated this week
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆20,199Updated this week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,638Jan 29, 2026Updated 5 months ago
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆19,514Updated this week
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆19,260Apr 30, 2026Updated 2 months ago
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆18,959Feb 16, 2026Updated 5 months ago
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,346Jul 16, 2026Updated last week
- This repo is used for servicing PR's for .NET Core 2.1 and 3.1. Please visit us at https://github.com/dotnet/runtime☆17,488Jan 21, 2023Updated 3 years ago
- Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and Open…☆17,145Updated this week
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆16,837Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆16,015Jun 30, 2026Updated 3 weeks ago
- Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você…☆15,734Jul 16, 2024Updated 2 years ago
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,381Updated this week
- One framework for creating powerful cross-platform games.☆14,224Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆14,166Updated this week
- Generate types and converters from JSON, Schema, and GraphQL☆13,805Updated this week
- 🏞 A fast, open-source, modern image viewer for 90+ formats – including WEBP, GIF, SVG, AVIF, JXL, HEIC and more – built for smooth brows…☆13,834Updated this week
- Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime…☆13,795Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,576Updated this week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆13,612May 26, 2026Updated 2 months ago
- Lightning-Fast, On-Device, Multilingual TTS — running natively via ONNX.☆13,516Updated this week
- Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.☆12,959Updated this week
- The official repo for the design of the C# programming language☆12,660Updated this week
- ASP.NET Boilerplate - Web Application Framework☆11,997Updated this week
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,707May 15, 2024Updated 2 years ago
- A .NET library that makes it easier to create beautiful console applications.☆11,560Updated this week
- Mono open source ECMA CLI, C# and .NET implementation.☆11,462Aug 27, 2024Updated last year
- Powerful .NET library for benchmarking☆11,464Updated this week