Portable game engine with main focus on point-and-click adventures
3D .NET engine for Windows, Linux, Mac
c# lua bind with unity3d project for game development
Free strategy browsergame engine.
Open source network game service
An open source skateboard games engine written in C# and .NET.
An extensible development framework for roleplay games.
Multi-Language Wrapper Collection for the Irrlicht Engine
A framework for games with defense towers along a path.
Isometric engine for 2D rendering with XNA and SDL