Blitz3D - Create 2D and 3D Games for Windows.
RPG Maker - Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!
BlitzPlus - Create 2D Games for Windows.
Flowlab - Flowlab is an online game creator. Make your own games to share with friends.
Monkey 2 - An easy to use, cross platform, games oriented programming language
Godot Engine - Feature-packed 2D and 3D open source game engine.