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
Powerful screen capture and file sharing tool for Windows
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
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.
The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
NLog - Flexible and Structured Logging for various .NET Platforms
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
DotnetSpider, a .NET standard web crawling library. It is lightweight, efficient and fast high-level web crawling & scraping framework
Headless Chrome .NET API
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.
Open-source feature flag management for seamless deployments
WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,
A modular, scalable and ultra-fast open-source all-in-one eCommerce platform built on ASP.NET Core 10
OpenBudgeteer is a budgeting app based on the Bucket Budgeting Principle
Windows Event Log tooling for PowerShell and .NET: typed queries, reporting, export, WEC, automation, and the PSEventViewer module.
Community-driven platform built for transparency
Related tags
Frequently asked questions
How many open source csharp projects are there?
This registry tracks 26 projects tagged csharp, with 262,236 GitHub stars between them. The most-adopted is Jellyfin at 57,244 stars.
Are these csharp projects free to use?
Yes — 24 of the 26 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?
21 of the 26 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.