.NET is a versatile and powerful open-source developer platform created by Microsoft that supports building applications for various environments, including web, mobile, desktop, gaming, and IoT. Its core framework facilitates the development of applications using languages like C#, F#, and Visual Basic, offering robust libraries and runtime components that enhance productivity and performance. Application developers benefit from .NET’s ability to streamline cross-platform development with its unification of platforms through .NET Core, ensuring that their applications can run seamlessly on major operating systems such as Windows, macOS, and Linux. Additionally, tools like Visual Studio and Visual Studio Code optimize the development workflow with advanced debugging, testing, and deployment capabilities. .NET’s strong community support, continuous updates, and integration with cloud services make it a reliable choice for developers aiming to build secure, scalable, and efficient applications.
View the most prominent open source .NET 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☆54,887Updated this week
- A modern file manager that helps users organize their files and folders.☆44,422Updated this week
- ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.☆38,233Updated this week
- A browser automation framework and ecosystem.☆34,312Updated this week
- Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI☆31,211Updated this week
- 🛠「Watt Toolkit」是一个开源跨平台的多功能 Steam 工具箱。☆26,262Jul 17, 2026Updated last week
- .NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!☆25,709Updated this week
- Pulumi - Infrastructure as Code in any programming language 🚀☆25,477Updated this week
- .NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.☆23,285Updated this week
- .NET news, announcements, release notes, and more!☆22,015Updated this week
- A collection of awesome .NET libraries, tools, frameworks and software☆21,504Mar 26, 2026Updated 3 months ago
- Clean Architecture Solution Template for ASP.NET Core☆20,357Updated this week
- Roadmap to becoming an ASP.NET Core developer in 2026☆19,636Jan 29, 2026Updated 5 months ago
- Bitwarden infrastructure/backend (API, database, Docker, etc).☆19,501Updated this week
- Clean Architecture Solution Template: A proven Clean Architecture Template for ASP.NET Core 10☆18,344Jul 16, 2026Updated last week
- .NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.☆18,108Updated 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☆17,490Jan 21, 2023Updated 3 years ago
- A framework for building native Windows apps with React.☆17,316Updated this week
- Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and Open…☆17,138Updated this week
- Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows…☆16,015Jun 30, 2026Updated 3 weeks ago
- Polly is a .NET resilience and transient-fault-handling library that allows developers to express policies such as Retry, Circuit Breaker…☆14,212Updated this week
- One framework for creating powerful cross-platform games.☆14,215Updated this week
- A wrapper executable that can run any executable as a Windows service, in a permissive license.☆14,163Updated this week
- Full Modular Monolith application with Domain-Driven Design approach.☆13,874Jun 4, 2024Updated 2 years ago
- 🏞 A fast, open-source, modern image viewer for 90+ formats – including WEBP, GIF, SVG, AVIF, JXL, HEIC and more – built for smooth brows…☆13,819Updated this week
- Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime…☆13,767Updated this week
- C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.☆13,569Updated this week
- Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.☆12,946Updated this week
- CoreCLR is the runtime for .NET Core. It includes the garbage collector, JIT compiler, primitive data types and low-level classes.☆12,768Jan 21, 2023Updated 3 years ago
- A framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and .NET.☆12,366Updated this week
- ASP.NET Boilerplate - Web Application Framework☆11,996Updated this week
- This is a collection of tutorials for learning how to use Docker with various tools. Contributions welcome.☆11,913Jul 27, 2023Updated 2 years ago
- A .NET library that makes it easier to create beautiful console applications.☆11,556Updated this week
- Mono open source ECMA CLI, C# and .NET implementation.☆11,462Aug 27, 2024Updated last year
- Powerful .NET library for benchmarking☆11,463Updated this week
- Cross Platform Terminal UI toolkit for .NET☆11,130Updated this week
- Cloud Native application framework for .NET☆10,815Updated this week
- Capture Screen, Audio, Cursor, Mouse Clicks and Keystrokes☆10,757May 25, 2026Updated 2 months ago
- 🌈【C#/.NET/.NET Core学习、工作、面试指南】记录、收集和总结C#/.NET/.NET Core基础知识、学习路线、开发实战、编程技巧练习、学习视频、文章、书籍、项目框架、社区组织、开发必备工具、技术前沿周刊、常见面试题、面试须知、简历模板、人才招聘、以及自…☆10,727Jun 28, 2026Updated 3 weeks ago
- Welcome to the AWS Code Examples Repository. This repo contains code examples used in the AWS documentation, AWS SDK Developer Guides, a…☆10,440Updated this week