Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Kodu Game Lab - Kodu lets kids create games on the PC and XBox via a simple visual programming language.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Ceilfire - Ceilfire is an online game maker for creating HTML5 games and sharing game assets. Make play and share games directly in your browser! Make Your Own Game!
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Flowlab - Flowlab is an online game creator. Make your own games to share with friends.