Bring macOS “Quick Look” feature to Windows

FNA - Accuracy-focused XNA4 reimplementation for open platforms

The Fluent Design XAML theme editor.

The Ultraviolet Framework is a .NET game development framework written in C#.

a simple cross-platform game framework made in C# dotnet core

A 2d game that aspires to be similar to Rimworld, with more depth, magic, and RPG concepts.

Source code of tactical space game Flotilla (2010)