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.
Sdk library for creating 2048 game in c#.
2D Game Engine
Modern 3D engine and IDE written using C# and C++.
Mad Vandal's FortressCraft Mod Source Code
Reactive extensions for Unity
Gives agents personality, moods, emotions and emotional attachments.
XNA based game engine completely written in c#
2D XNA Game Engine
A 2D tile map editor created using .NET framework.
2D top down arcade shooter