Open source csharp projects
Every project in the registry tagged csharp, ranked by real GitHub adoption.
Self-hosted media server for movies, music, and more
A modern file manager that helps users organize their files and folders.
Powerful screen capture and file sharing tool for Windows
A Swiss Army knife for developers.
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
Infrastructure as code in your favorite language
Secure password management for individuals and businesses
Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Li
Free, open-source framework for cross-platform game development
A distributed transaction framework, supports workflow, saga, tcc, xa, 2-phase message, outbox patterns, supports many languages.
Polyglot document intelligence with a Rust core: extract text, metadata, images, tables, and structured data from 106 formats across 140 file extensions, plus c
Stride (formerly Xenko), a free and open-source cross-platform C# game engine.
The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
Interactive plotting library for .NET
NLog - Flexible and Structured Logging for various .NET Platforms
The framework for building with WebAssembly (wasm). Easily & securely load wasm modules, move data, call functions, and build extensible apps.
Flash浏览器 / Flash Browser
Umbraco is a free and open source .NET content management system helping you deliver delightful digital experiences.
OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python
Static site generator for .NET API documentation.
A simple, cross platform, modulith ecommerce system built on .NET
Free and open-source PDF editor for Windows with a built-in PDF 2.0 engine. View, annotate, OCR, merge, split, crop, rotate, compare, edit text, draw, sign, fil
DotnetSpider, a .NET standard web crawling library. It is lightweight, efficient and fast high-level web crawling & scraping framework
Headless Chrome .NET API
OpenAPI based HTTP Client code generator
Cairo is a customizable, intuitive desktop environment for Windows.
Free open source office suite with business productivity tools: document and project management, CRM, mail aggregator.
Free Open Source Reporting tool for .NET6/.NET Core/.NET Framework that helps your application generate document-like reports
Headless CMS and Content Managment Hub
Guia de Back-end: trilhas, cursos, livros, canais, ferramentas e comunidades para você entrar e evoluir na área.
Cross Platform C# web crawler framework built for speed and flexibility. Please star this project! +1.
A cross-platform C# editor and playground.
Open-source feature flag management for seamless deployments
A modular, scalable and ultra-fast open-source all-in-one eCommerce platform built on ASP.NET Core 10
WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,
E-commerce platform built with ASP.NET Core using MongoDB for NoSQL storage
Cross-platform video editing (compositing) software.
:rocket: Release projects quickly and easily with JReleaser
Instant SECURE Full Stack Apps and AI Agents
Browse the sample apps demonstrating Aspire integration across C#, JavaScript, TypeScript, Python, Go, containers, databases, cloud, AI, and observability scena
Adding `.Dump()` extension methods to Console Applications, similar to LinqPad's.
SimpleITK: a layer built on top of the Insight Toolkit (ITK), intended to simplify and facilitate ITK's use in rapid prototyping, education and interpreted lang
OpenBudgeteer is a budgeting app based on the Bucket Budgeting Principle
一个基于 .NET 8.0 构建的简单、跨平台、模块化的商城系统
MCP Gateway is a reverse proxy and management layer for MCP servers, enabling scalable, session-aware stateful routing and lifecycle management of MCP servers i
Cofoundry is an extensible and flexible .NET Core CMS & application framework focusing on code first development
Workflow Automation Engine
A Tumblr and Twitter Blog Backup Application
Windows Event Log tooling for PowerShell and .NET: typed queries, reporting, export, WEC, automation, and the PSEventViewer module.
TeslaLogger is a self hosted data logger for your Tesla Model S/3/X/Y. Actually it supports RaspberryPi 3B, 3B+, 4B, Docker and Synology NAS.
Write your pipelines in C# !
Camelot is a cross-platform file manager written in C#
An open-source Low-Code development framework for .NET developers. Create .NET based business applications with 80% less code.
Community-driven platform built for transparency
Related tags
Frequently asked questions
How many open source csharp projects are there?
This registry tracks 54 projects tagged csharp, with 426,086 GitHub stars between them. The most-adopted is Jellyfin at 58,942 stars.
Are these csharp projects free to use?
Yes — 52 of the 54 carry an explicit open-source licence across 6 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which csharp project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these csharp projects still maintained?
46 of the 54 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.