Flowlab - Flowlab is an online game creator. Make your own games to share with friends.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Wick Editor - The Internet's free and open-source creation toolkit.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Unity - The multiplatform game creation tools for everyone.
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!