Unity - The multiplatform game creation tools for everyone.
Tynker - Game Worlds for Kids to Learn Programming
Godot Engine - Feature-packed 2D and 3D open source game engine.
CodeCombat - Learn programming with a multiplayer live coding strategy game.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
StackHive - Design, develop or publish websites right from your browser