Blitz3D - Create 2D and 3D Games for Windows.
microStudio - microStudio is an all-in-one online game engine that enables you to create games, develop programming skills, have fun playing what you have created, share with others, and prototype.
BlitzPlus - Create 2D Games for Windows.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Monkey 2 - An easy to use, cross platform, games oriented programming language
ENIGMA – LateralGM - LateralGM is a powerful IDE for ENIGMA, and both of these combine to offer you a cross-platform game environment.