One framework for creating powerful cross-platform games.

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

A wrapper executable that can run any executable as a Windows service, in a permissive license.

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)

Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor.

.NET core API Gateway

AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.

Powerful .NET library for benchmarking

The mobile app vault (iOS and Android).

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

Every programmer needs a rubberduck. COM add-in for the VBA & VB6 IDE (VBE).

Build Mobile, Desktop and WebAssembly apps with C# and XAML. Today. Open source and professionally supported.

:cake: Cake (C# Make) is a cross platform build automation system.

.NET for Apache® Spark™ makes Apache Spark™ easily accessible to .NET developers.

An open source fork of Windows Live Writer

ML.NET is an open source and cross-platform machine learning framework for .NET.

Open Source Web Application Framework for ASP.NET Core

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

💫 NClient is an automatic type-safe .Net HTTP client that allows you to call web service API methods using annotated interfaces or controllers without boilerplate code.

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

Highly performant and modular controls for node-based editors designed for data-binding and MVVM.

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

Linq to database provider.

Google's Material Design in XAML & WPF, for C# & VB.Net.

A cross-platform plotting library for .NET