Borderlands - Borderlands is a science fiction first-person shooter with RPG elements made with cel-shaded...
Unity - The multiplatform game creation tools for everyone.
Bulletstorm - In this sci-fi first person shooter, players take on the role of mercenary Grayson Hunt in an attempt to get off a hostile alien planet and get a little bit of vengeance along the way.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Urban Terror - Urban Terror started as a realism based "total conversion" mod for Quake III Arena.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.