Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Blockly - Blockly is a library for building visual programming editors.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Coin Pusher - Coin Pusher is an Addictive Puzzle game by Coin Unity.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.