CRYENGINE one of the most advanced game engines around powering a ton of games has finally announced official Linux support, so Crytek how about some Crysis on Linux?
Platinum Arts Sandbox Game Maker is an easy to use Game Maker featuring in game and coop editing based on the Cube 2 Engine. Now Kickstarter and Steam Greenlight Projects have been launched to greatly accelerate and increase the features in the engine.