Top C-SHARP GitHub Repositories & Tools (2026)

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)

C# application with primary purpose of farming Steam cards from multiple accounts simultaneously.

.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.

ASP.NET Boilerplate - Web Application Framework

mRemoteNG is the next generation of mRemote, open source, tabbed, multi-protocol, remote connections manager.

A framework that allows developers to cobble together a better UI for their own WPF applications with minimal effort.

Distributed Application Framework for .NET

Quartz Enterprise Scheduler .NET

A cross-platform .NET library for IMAP, POP3, and SMTP.

This repository is for active development of the Azure SDK for .NET. For consumers of the SDK we recommend visiting our public developer docs at https://learn.microsoft.com/dotnet/azure/ or our versioned developer docs at https://azure.github.io/azure-sdk-for-net.

Unified Realtime/API framework for .NET platform and Unity.

☕️⚡️TShock provides Terraria servers with server-side characters, anti-cheat, and community management tools.

NUnit Framework

A cross-platform high performing HTTP(S) proxy server in C#.

Fluent NHibernate!

Cross-platform video editing (compositing) software.

Re-implementation of The Sims Online.

Cross-platform 2D game engine focused on ultimate productivity built in .NET

MIT-licensed, COM-free .NET libraries for creating, reading, editing, converting, rendering, and extracting Office, PDF, email, OneNote, and text formats.