Cecil is a library to inspect, modify and create .NET programs
GeneticSharp is a fast, extensible, multi-platform and multithreading
The FileHelpers are a free and easy to use .NET library to read/write
A library containing all P/Invoke code so you don't have to import it
CodeMaid is an open source Visual Studio extension to cleanup
Near-zero config .NET Core micro-framework
A GUI framework for C# console applications
UI library that brings the simplicity of native UI development to web
App Metrics is an open-source and cross-platform .NET library
The best library to work with the .Net Core from Delphi and Lazarus.
Tweetinvi, an intuitive Twitter C# library for the REST and Stream API
Build .NET desktop applications using HTML, CSS and javascript
Create Windows Shell Extensions using the .NET Framework
.NET control that hosts the audio/video capabilities of the VLC libs
An advanced audio library, written in C#. Provides tons of features
Machine learning, computer vision, statistics and computing for .NET
Scientific computing, machine learning and computer vision for .NET
qxdotnet is a server side ASP.NET wrapper for qooxdoo library
Lightweight fully extendable client/server application framework
Make robots for MediaWiki-powered sites!
A model-based test automation framework for GUI applications
Myth Framework Core Libraries (part of MythSDP)