MonoDevelop is a cross platform .NET IDE

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

.NET core API Gateway

A cross-platform plotting library for .NET

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

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

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

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

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

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

An open source fork of Windows Live Writer

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

One framework for creating powerful cross-platform games.

Linq to database provider.

A cross platform, self-hosted server compatible with Bitpay API

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

Free and Open Source Ecommerce Shopping Cart solution based on ASP.NET CORE and MongoDB

Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET developers.

🦄 .NET orm, Mysql orm, Postgresql orm, SqlServer orm, Oracle orm, Sqlite orm, Firebird orm, 达梦 orm, 人大金仓 orm, 神通 orm, 翰高 orm, 华为GaussDB orm, MsAccess orm.

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

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

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

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

Powerful .NET library for benchmarking

Headless Chrome .NET API

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.