Stride (formerly Xenko), a free and open-source cross-platform C# game
Svelto ECS C# Entity Component System
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
inputbox password WIN OSX GTK QT Console VCPKG C# Lua R Fortran Pascal
Vivid3D is an open-source 3D engine with powerful 2D UI.
Modern 3D engine and IDE written using C# and C++.
3D .NET engine for Windows, Linux, Mac
XNA based game engine completely written in c#
An expanded XNA game creation framework
Open Source Virtual World and MMOG Development Platform
RPG Games without coding!