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☆50,747Updated this week
- A modern file manager that helps users organize their files and folders.☆43,116Updated 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…☆36,270Updated 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☆35,949Updated this week
- A Swiss Army knife for developers.☆31,272Feb 25, 2026Updated 2 months ago
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆30,911Apr 15, 2026Updated last week
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI☆30,639Updated this week
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆25,251Mar 11, 2026Updated last month
- Pulumi - Infrastructure as Code in any programming language 🚀☆25,101Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆24,877Mar 22, 2026Updated last month
- A collection of awesome .NET libraries, tools, frameworks and software☆21,290Mar 26, 2026Updated last month
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,199Feb 27, 2026Updated 2 months ago
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,370Apr 21, 2026Updated last week
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆19,729Updated this week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,569Jan 29, 2026Updated 2 months ago
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆18,831Feb 16, 2026Updated 2 months ago
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆18,693Updated this week
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆18,483Updated this week
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,122Apr 3, 2026Updated 3 weeks ago
- 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☆17,507Jan 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…☆16,644Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆15,987Apr 17, 2026Updated last week
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆15,956Updated this week
- Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você…☆15,650Jul 16, 2024Updated last year
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,215Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆13,893Updated this week
- One framework for creating powerful cross-platform games.☆13,783Updated this week
- Generate types and converters from JSON, Schema, and GraphQL☆13,712Oct 27, 2025Updated 6 months ago
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,248Updated this week
- 🏞 A lightweight, versatile image viewer☆12,962Apr 17, 2026Updated last week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆12,882Apr 10, 2026Updated 2 weeks ago
- The official repo for the design of the C# programming language☆12,577Updated this week
- Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.☆12,527Updated this week
- ASP.NET Boilerplate - Web Application Framework☆11,976Jan 27, 2026Updated 3 months ago
- Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime…☆11,814Updated this week
- Mono open source ECMA CLI, C# and .NET implementation.☆11,437Aug 27, 2024Updated last year
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,402May 15, 2024Updated last year
- Powerful .NET library for benchmarking☆11,400Apr 19, 2026Updated last week
- A .NET library that makes it easier to create beautiful console applications.☆11,365Updated this week
- A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for cust…☆11,237Updated this week