A modern file manager that helps users organize their files and folders.

Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology

.NET debugger and assembly editor

Bitmap & tilemap generation from a single example with the help of ideas from quantum mechanics

Generate and edit PDF documents in your .NET applications using the open-source QuestPDF library and its C# Fluent API. Build invoices, reports and data exports with ease.

Mono open source ECMA CLI, C# and .NET implementation.

Build cross platform desktop apps with ASP.NET Core (Razor Pages, MVC, Blazor).

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

NLog - Flexible and Structured Logging for various .NET Platforms

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.

The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support

Static site generator for .NET API documentation.

ACID Document Database

Command line parsing, invocation, and rendering of terminal output.

Mixbox is a library for natural color mixing based on real pigments.

Assistive Context-Aware Toolkit (ACAT)

Theming .NET WinForms, C# or VB.Net, to Google's Material Design Principles.

(Obsolete) Archive of Rant 3.x.

A low-level, portable graphics library for .NET.

A library containing all P/Invoke code so you don't have to import it every time. Maintained and updated to support the latest Windows OS.

Demo of the potential of C# for systems programming with the .NET native ahead-of-time compilation technology.

A port of Clojure to the CLR, part of the Clojure project

Cross framework (WinForms/WPF/PDF/Metro/Mono/etc.), Multipurpose (UI Controls / Image generation / PDF generation / etc.), 100% managed (C#), High performance HTML Rendering library.

An advanced profiler for .NET Applications on Windows

.NET DllExport with .NET Core support (aka 3F/DllExport aka DllExport.bat)

A lightweight and fast parsing library for C#.

Texture synthesis from examples

A collection of .NET libraries for rendering mathematical formulae using the LaTeX typesetting style, for the WPF and Avalonia XAML-based frameworks

Static interface to dynamic implementation (duck casting). Uses the DLR combined with Reflect.Emit.

Modern OpenGL bindings for C#.