3D puzzle game based on Kula World and Cubosphere
GameWhizzards is a user created, Open Source 3D MMORPG
Save game editor for Imperium Galactica 1
Super Mario RPG Editor that can edit nearly everything in the game
The Map-Editor of the 2D role-playing game Arengu
DREAM is an Open Source GCS
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor
SmartMap is an easy desktop random world creator.