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☆48,779Updated this week
- A modern file manager that helps users organize their files and folders.☆42,027Feb 20, 2026Updated last 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☆35,668Updated 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…☆35,699Updated this week
- A Swiss Army knife for developers.☆30,981Jan 9, 2026Updated last month
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆30,865Dec 24, 2025Updated 2 months ago
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology☆30,099Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆24,705Nov 25, 2025Updated 3 months ago
- Pulumi - Infrastructure as Code in any programming language 🚀☆24,818Updated this week
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆24,509Feb 13, 2026Updated 2 weeks ago
- A collection of awesome .NET libraries, tools, frameworks and software☆21,126Sep 16, 2025Updated 5 months ago
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,095Apr 3, 2025Updated 10 months ago
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,251Updated this week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,541Jan 29, 2026Updated 3 weeks ago
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆19,340Feb 14, 2026Updated 2 weeks ago
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆18,730Feb 16, 2026Updated last week
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆18,270Jan 21, 2026Updated last month
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆18,085Updated this week
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,020Updated 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☆17,534Jan 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…☆16,461Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆16,006Feb 15, 2026Updated last week
- Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você…☆15,574Jul 16, 2024Updated last year
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆14,483Updated this week
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,171Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆13,705Feb 9, 2026Updated 2 weeks ago
- Generate types and converters from JSON, Schema, and GraphQL☆13,632Oct 27, 2025Updated 4 months ago
- One framework for creating powerful cross-platform games.☆13,195Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,089Updated this week
- The official repo for the design of the C# programming language☆12,509Feb 21, 2026Updated last week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆12,516Feb 20, 2026Updated last week
- 🏞 A lightweight, versatile image viewer☆12,269Feb 19, 2026Updated last week
- ASP.NET Boilerplate - Web Application Framework☆12,000Jan 27, 2026Updated last month
- Mono open source ECMA CLI, C# and .NET implementation.☆11,425Aug 27, 2024Updated last year
- Powerful .NET library for benchmarking☆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…☆11,218Updated this week
- A .NET library that makes it easier to create beautiful console applications.☆11,234Updated this week
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,200May 15, 2024Updated last year
- Apache Thrift☆10,906Updated this week
- A distributed transaction framework, supports workflow, saga, tcc, xa, 2-phase message, outbox patterns, supports many languages.☆10,828Jan 3, 2026Updated last month