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.
- The Free Software Media System - Server Backend & API☆57,496Updated this week
- A modern file manager that helps users organize their files and folders.☆45,664Updated 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…☆39,744Updated 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☆36,624Updated this week
- A Swiss Army knife for developers.☆32,027Feb 25, 2026Updated 7 months ago
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI☆31,566Updated this week
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆31,055Sep 16, 2026Updated last week
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆26,959Aug 31, 2026Updated 3 weeks ago
- Pulumi - Infrastructure as Code in any programming language 🚀☆25,729Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆25,343Mar 22, 2026Updated 6 months ago
- A collection of awesome .NET libraries, tools, frameworks and software☆21,628Mar 26, 2026Updated 6 months ago
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,391Feb 27, 2026Updated 6 months ago
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,688Updated this week
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆20,574Updated this week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,647Jan 29, 2026Updated 7 months ago
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆20,198Updated this week
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆19,666Apr 30, 2026Updated 4 months ago
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆19,015Feb 16, 2026Updated 7 months ago
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,494Updated this 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☆17,465Jan 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…☆17,434Sep 14, 2026Updated last week
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆17,307Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆16,017Jun 30, 2026Updated 2 months ago
- Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você…☆15,787Sep 2, 2026Updated 3 weeks ago
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,437Updated this week
- One framework for creating powerful cross-platform games.☆14,450Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆14,326Jul 30, 2026Updated last month
- Generate types and converters from JSON, Schema, and GraphQL☆13,876Sep 13, 2026Updated last week
- 🏞 A fast, open-source, modern image viewer for 90+ formats – including WEBP, GIF, SVG, AVIF, JXL, HEIC and more – built for smooth brows…☆14,476Updated this week
- Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime…☆14,967Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,705Updated this week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆14,069Updated this week
- Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.☆13,411Updated this week
- The official repo for the design of the C# programming language☆12,712Sep 18, 2026Updated last week
- ASP.NET Boilerplate - Web Application Framework☆11,998Updated this week
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,858May 15, 2024Updated 2 years ago
- A .NET library that makes it easier to create beautiful console applications.☆11,635Updated this week
- Mono open source ECMA CLI, C# and .NET implementation.☆11,464Aug 27, 2024Updated 2 years ago
- Powerful .NET library for benchmarking☆11,496Updated this week