One framework for creating powerful cross-platform games
Unity3D Client And C# Server Framework
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#
A 2D tile map editor created using .NET framework.
this is tic tac toe or zero cross game(for windows os)
An open source skateboard games engine written in C# and .NET.
DREAM is an Open Source GCS