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☆50,005Updated this week
- A modern file manager that helps users organize their files and folders.☆42,799Updated 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…☆36,076Updated 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☆35,839Mar 31, 2026Updated last week
- A Swiss Army knife for developers.☆31,146Feb 25, 2026Updated last month
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆30,887Dec 24, 2025Updated 3 months ago
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI☆30,456Updated this week
- Pulumi - Infrastructure as Code in any programming language 🚀☆24,937Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆24,824Mar 22, 2026Updated 2 weeks ago
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆24,993Mar 11, 2026Updated 3 weeks ago
- A collection of awesome .NET libraries, tools, frameworks and software☆21,226Mar 26, 2026Updated last week
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,156Feb 27, 2026Updated last month
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,324Mar 31, 2026Updated last week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,554Jan 29, 2026Updated 2 months ago
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆19,614Updated this week
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆18,806Feb 16, 2026Updated last month
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆18,563Mar 31, 2026Updated last week
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆18,352Updated this week
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,106Mar 18, 2026Updated 2 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☆17,525Jan 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…☆16,577Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆15,999Mar 13, 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…☆15,630Jul 16, 2024Updated last year
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆15,725Mar 29, 2026Updated last week
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,189Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆13,822Mar 23, 2026Updated 2 weeks ago
- Generate types and converters from JSON, Schema, and GraphQL☆13,690Oct 27, 2025Updated 5 months ago
- One framework for creating powerful cross-platform games.☆13,615Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,207Updated this week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆12,741Feb 20, 2026Updated last month
- The official repo for the design of the C# programming language☆12,553Updated this week
- 🏞 A lightweight, versatile image viewer☆12,682Mar 20, 2026Updated 2 weeks ago
- ASP.NET Boilerplate - Web Application Framework☆11,991Jan 27, 2026Updated 2 months ago
- Mono open source ECMA CLI, C# and .NET implementation.☆11,440Aug 27, 2024Updated last year
- Powerful .NET library for benchmarking☆11,389Mar 31, 2026Updated last week
- A .NET library that makes it easier to create beautiful console applications.☆11,314Mar 24, 2026Updated 2 weeks ago
- A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for cust…☆11,230Updated this week
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,329May 15, 2024Updated last year
- Apache Thrift☆10,909Updated this week
- A distributed transaction framework, supports workflow, saga, tcc, xa, 2-phase message, outbox patterns, supports many languages.☆10,852Jan 3, 2026Updated 3 months ago