The Reactive Extensions for .NET

C# pure functional programming framework - come and get declarative!

Web Application ASP.NET 9 using Clean Architecture, DDD, CQRS, Event Sourcing and a lot of good practices

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

Fast persistent recoverable log and key-value store + cache, in C# and C++.

Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]

Interactive plotting library for .NET

The Windows Community Toolkit is a collection of helpers, extensions, and custom controls. It simplifies and demonstrates common developer tasks building .NET apps with UWP and the Windows App SDK …

Lightweight workflow engine for .NET Standard

ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXM…

Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET develo…

Aspire is the tool for code-first, extensible, observable dev and deploy.

A fast, powerful, CommonMark compliant, extensible Markdown processor for .NET

A pure C# Open Source QR Code implementation

A fast, fun and stimulating object to object Mapper

Library for interacting with command-line interfaces

Port of macOS Mojave Dynamic Desktop feature to Windows

Zero allocation LINQ with LINQ to Span, LINQ to SIMD, and LINQ to Tree (FileSystem, JSON, GameObject, etc.) for all .NET platforms and Unity, Godot.

Microsoft Fluent UI Blazor components library. For use with ASP.NET Core Blazor applications

xUnit.net is a free, open source, community-focused unit testing tool for .NET.

.NET aot orm, VB.NET/C# orm, Mysql/PostgreSQL/SqlServer/Oracle orm, Sqlite/Firebird/Clickhouse/DuckDB orm, 达梦/金仓/虚谷/翰高/高斯 orm, 神通 orm, 南大通用 orm, 国产 orm, TDengine orm, QuestDB orm, MsAccess orm.

🌀 Clean Architecture with .NET6, C#10 and React+Redux. Use cases as central organizing structure, completely testable, decoupled from frameworks

Assembly scanning and decoration extensions for Microsoft.Extensions.DependencyInjection

A modern Fluent Design replacement for the old Metro themed flyouts present in Windows.

ACID Document Database

C# as you know it but with Go-inspired tooling (small, selfcontained, and native executables)

A .NET source generator for generating object mappings. No runtime reflection.

Math.NET Numerics

🏗 The AKEless Build System for C#/.NET

A modern, fast and flexible .NET testing framework