One framework for creating powerful cross-platform games
Ze Text Adventure game Builder : Create as you play !
Vivid3D is an open-source 3D engine with powerful 2D UI.
Sdk library for creating 2048 game in c#.
2D Game Engine
Portable game engine with main focus on point-and-click adventures
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
A starter development kit that let you develop FF6-like games on PC.
3D .NET engine for Windows, Linux, Mac
Free strategy browsergame engine.
A cross-platform game framework based on OpenGL and GObject.
Open source network game service
An open source skateboard games engine written in C# and .NET.
An extensible development framework for roleplay games.
Open Source Virtual World and MMOG Development Platform
Multi-Language Wrapper Collection for the Irrlicht Engine
A framework for games with defense towers along a path.