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☆49,365Updated this week
- A modern file manager that helps users organize their files and folders.☆42,386Updated 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…☆35,878Updated 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☆35,785Updated this week
- A Swiss Army knife for developers.☆31,078Feb 25, 2026Updated 3 weeks ago
- Windows Calculator: A simple yet powerful calculator that ships with Windows☆30,870Dec 24, 2025Updated 2 months ago
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology☆30,245Updated this week
- Pulumi - Infrastructure as Code in any programming language 🚀☆24,913Updated this week
- Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics☆24,762Nov 25, 2025Updated 3 months ago
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆24,748Mar 11, 2026Updated last week
- A collection of awesome .NET libraries, tools, frameworks and software☆21,175Sep 16, 2025Updated 6 months ago
- A collection of awesome .NET core libraries, tools, frameworks and software☆21,131Feb 27, 2026Updated 2 weeks ago
- The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.☆20,276Mar 11, 2026Updated last week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,551Jan 29, 2026Updated last month
- PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)☆19,484Updated this week
- ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structure…☆18,784Feb 16, 2026Updated last month
- Free and open-source software that allows users to set animated desktop wallpapers and screensavers powered by WinUI 3.☆18,442Mar 10, 2026Updated last week
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆18,260Updated this week
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,064Updated 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☆17,528Jan 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…☆16,515Feb 26, 2026Updated 2 weeks ago
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆16,004Mar 10, 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…☆15,610Jul 16, 2024Updated last year
- This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .N…☆15,440Updated this week
- Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with be…☆14,181Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆13,752Mar 9, 2026Updated last week
- Generate types and converters from JSON, Schema, and GraphQL☆13,660Oct 27, 2025Updated 4 months ago
- One framework for creating powerful cross-platform games.☆13,314Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,153Updated this week
- Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface…☆12,633Feb 20, 2026Updated 3 weeks ago
- The official repo for the design of the C# programming language☆12,535Updated this week
- 🏞 A lightweight, versatile image viewer☆12,507Updated this week
- ASP.NET Boilerplate - Web Application Framework☆11,993Jan 27, 2026Updated last month
- Mono open source ECMA CLI, C# and .NET implementation.☆11,430Aug 27, 2024Updated last year
- Powerful .NET library for benchmarking☆11,372Mar 10, 2026Updated last week
- A .NET library that makes it easier to create beautiful console applications.☆11,269Updated this week
- A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for cust…☆11,221Updated this week
- A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues.☆11,247May 15, 2024Updated last year
- Apache Thrift☆10,910Updated this week
- A distributed transaction framework, supports workflow, saga, tcc, xa, 2-phase message, outbox patterns, supports many languages.☆10,841Jan 3, 2026Updated 2 months ago