Open-source reimplementation of the Kenshi engine in C# / .NET 10 (Vulkan renderer first). Needs your own copy of Kenshi.
FNA - Accuracy-focused XNA4 reimplementation for open platforms
Impostor - An open source reimplementation of the Among Us Server
A modern C# reimplementation of Wolfenstein 3D.
A from-scratch reimplementation of the Knight Online game server and client