Amazon’s releasing their very own game engine. Lumberyard, as they call it, is based on Crytek’s famous CryEngine, and can be used to develop games for both PC and consoles. It’s also free to download, and comes with “no seat fees, subscription fees, or requirements to share revenue.”
Motores gráficos en videojuegos: game engine - Para todas aquellas personas que han querido saber cómo se creaba un videojuego, en este curso vamos a explicar cómo crear un pequeño motor, uno de los elementos nucleares de cualquier videojuego; For those who ever wanted to know how to create a video game, in this course we will explain how to create a small engine, one of the main elements in any video game
vassal. Open Source game engine designed for building and playing online adaptations of board, card, and parlor games. Runs native on all legitimate operating systems, could be compiled relatively easy on the rest. Hundreds of pre-made modules for popular games like Risk, Axis & Allies, etc. etc. etc. Free as in beer, and maybe liberty as well (but I'm looking for beer right now...).
Xbox One gets Unity game engine support in 2014, licenses free for all ID@Xbox devs