One framework for creating powerful cross-platform games
Ze Text Adventure game Builder : Create as you play !
Sdk library for creating 2048 game in c#.
Modern 3D engine and IDE written using C# and C++.
Portable game engine with main focus on point-and-click adventures
Solve, explore and create Sudokus
2D XNA Game Engine
GameWizzard is a Sprite editor.
Open Source Virtual World and MMOG Development Platform