42 open source projects written in C#
Every C# project in the registry, ranked by GitHub stars — license and last push on every entry, data pulled live from the GitHub API every night.
Jellyfin ★ 57K Self-hosted media server for movies, music, and more
ShareX ★ 40K Powerful screen capture and file sharing tool for Windows
Avalonia ★ 32K Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
Bitwarden ★ 20K Secure password management for individuals and businesses
MonoGame ★ 14K Free, open-source framework for cross-platform game development
Ocelot ★ 8.7K .NET API Gateway
OrchardCore ★ 8.2K Orchard Core is an open-source modular and multi-tenant application framework built with ASP.NET Core, and a content management system (CMS) built on top of tha
NSwag ★ 7.4K The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
FASTER ★ 6.6K Fast persistent recoverable log and key-value store + cache, in C# and C++.
NLog ★ 6.5K NLog - Flexible and Structured Logging for various .NET Platforms
s&box ★ 6.5K Build and play games inside a game engine that runs live
workflow-core ★ 5.9K Lightweight workflow engine for .NET Standard
Umbraco-CMS ★ 5.3K Umbraco is a free and open source .NET content management system helping you deliver delightful digital experiences.
SparkleShare ★ 5.0K Share and collaborate by syncing with any Git repository instantly. Linux, macOS, and Windows
Harden-Windows-Security ★ 4.7K Harden Windows Safely, Securely using Official Supported Microsoft methods and proper explanation | Always up-to-date and works with the latest build of Windows
docfx ★ 4.4K Static site generator for .NET API documentation.
SimplCommerce ★ 4.4K A simple, cross platform, modulith ecommerce system built on .NET
cake ★ 4.2K :cake: Cake (C# Make) is a cross platform build automation system.
DotnetSpider ★ 4.1K DotnetSpider, a .NET standard web crawling library. It is lightweight, efficient and fast high-level web crawling & scraping framework
puppeteer-sharp ★ 3.9K Headless Chrome .NET API
cairoshell ★ 3.4K Cairo is a customizable, intuitive desktop environment for Windows.
run-aspnetcore-microservices ★ 3.3K Microservices on .NET platforms used ASP.NET Web API, Docker, RabbitMQ, MassTransit, Grpc, Yarp API Gateway, PostgreSQL, Redis, SQLite, SqlServer, Marten, Entit
CommunityServer ★ 3.2K Free open source office suite with business productivity tools: document and project management, CRM, mail aggregator.
FastReport ★ 3.1K Free Open Source Reporting tool for .NET6/.NET Core/.NET Framework that helps your application generate document-like reports
FluentScheduler ★ 2.8K Automated job scheduler with fluent interface for the .NET platform.
Audit.NET ★ 2.7K An extensible framework to audit executing operations in .NET
squidex ★ 2.5K Headless CMS and Content Managment Hub
paylinks ★ 1.9K 一套基于 现代 .NET 开发，支持跨平台、多商户的第三方支付SDK。
WireMock.Net ★ 1.7K WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,
Seal-Report ★ 1.6K Database Reporting Tool and Tasks (.Net)
Smartstore ★ 1.5K A modular, scalable and ultra-fast open-source all-in-one eCommerce platform built on ASP.NET Core 10
drasi-platform ★ 1.3K The Data Change Processing platform
OpenBudgeteer ★ 973 OpenBudgeteer is a budgeting app based on the Bucket Budgeting Principle
power-bi-agentic-development ★ 919 Power BI AI skills and Power BI agents for Claude Code and GitHub Copilot: a plugin marketplace of Power BI skills, subagents, and hooks for semantic models, DA
mix.core ★ 888 🚀 A future-proof enterprise web CMS supporting both headless and decoupled approaches. Build any type of app with customizable APIs on ASP.NET Core/.NET Core.
budget-board ★ 884 A simple app for tracking monthly spending and working towards financial goals.
dev-proxy ★ 831 Simulate API failures, throttling, and chaos — all from your command line.
EventViewerX ★ 731 Windows Event Log tooling for PowerShell and .NET: typed queries, reporting, export, WEC, automation, and the PSEventViewer module.
FluentCMS ★ 566 ASP.NET Core Blazor Content Management System (CMS)
Binner ★ 537 Open source parts inventory system for makers, electronics hobby, and professional engineers
Sportarr ★ 529 Sportarr - Sports PVR for usenet and torrents. Like Sonarr & Radarr but for sports events.
Valour ★ 397 Community-driven platform built for transparency
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Frequently asked questions
How many open source projects are written in C#?
This registry tracks 42 C# projects, with 284,925 GitHub stars between them and a median of 3,263 stars. The most-adopted is Jellyfin at 57,244 stars.
Which C# projects are most actively maintained?
32 of the 42 projects were pushed in the last 90 days. Each entry above shows its exact last-push date, so you can filter out dormant projects before committing to one.
What licence are C# projects usually under?
39 of the 42 carry an explicit open-source licence across 8 distinct licences, and the licence is shown on every card. Permissive licences (MIT, Apache-2.0) are the safest default for commercial use; check the copyleft ones individually.
Should I use C# or Java for my project?
Both are viable. C# is the better default if your team already knows it or the libraries you need are written in it; Java may suit you better if you need the ecosystem, tooling or performance profile it is known for. The registry lists 42 C# projects to work from.