Developed by devhub.io
Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Windows 10 UWP, and Xamarin Forms.
A cross-platform .NET library for IMAP, POP3, and SMTP.
Elasticsearch.Net & NEST
:angel: The ultimate angle brackets parser library parsing HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specifications.
Play your favorite games in a borderless window; no more time consuming alt-tabs.
A small, yet powerful framework, designed for building applications across all XAML platforms. Its strong support for MV* patterns will enable you to build your solution quickly, without the need to sacrifice code quality or testability.
Cake (C# Make) is a cross platform build automation system.
SharePoint / Office 365 Developer Patterns and Practices
NHibernate Object Relational Mapper
The most popular service bus for .NET
Bonobo Git Server for Windows is a web application you can install on your IIS and easily manage and connect to your git repositories. Go to homepage for release and more info.
Npgsql is the .NET data provider for PostgreSQL.