ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

Powerful .NET library for benchmarking

Cross Platform Terminal UI toolkit for .NET

Incredibly simple real-time web for .NET

The automatic type-safe REST library for .NET Core, Xamarin and .NET. Heavily inspired by Square's Retrofit library, Refit turns your REST API into a live interface.

Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono

Distributed Application Framework for .NET

Stack Exchange's Monitoring System

An easy service hosting framework for building Windows services using .NET

Source from the Microsoft .NET Reference Source that represent a subset of the .NET Framework

Kudu is the engine behind git/hg deployments, WebJobs, and various other features in Azure Web Sites. It can also run outside of Azure.

A lightweight NuGet and symbol server

Write C# apps with a text editor, nuget and the power of Roslyn!

CacheManager is an open source caching abstraction layer for .NET written in C#. It supports various cache providers and implements many advanced features.

#1 .NET BDD Framework. SpecFlow automates your testing & works with your existing code. Find Bugs before they happen. Behavior Driven Development helps developers, testers, and business representat…

NHibernate Object Relational Mapper

A small, happy, dynamic MicroORM for .NET that will love you forever.

A C# implementation of the OpenID, OAuth protocols

Castle Windsor is a best of breed, mature Inversion of Control container available for .NET

Manage localization of all ResX-Based resources in one central place.

RoundhousE is a Database Migration Utility for .NET using sql files and versioning based on source control

Machine.Specifications is a Context/Specification framework for .NET that removes language noise and simplifies tests.

🏷 Minimalistic versioning using Git tags.

Ergonomic Testing for .NET

It's like ClickOnce but Works™

A site generation tool (and then some) for .NET platforms

Intuitive, robust browser automation for .Net

Cross-platform toolkit for easy development of TUI applications.

Manages .NET web application assets (scripts, css and templates)

A simple framework for providing auto-update support to .NET applications