Amazon has both announced and released a free game engine, Lumberyard, which offers deep integration with its Amazon Web Services server infrastructure to empower online play, and also with Twitch, its video game-focused streaming service.
The engine, including its full source code, is completely free to download and use to make PC and console games. Amazon will not charge any kind of royalty or subscription fee.
I haven’t looked into it, but a friend described it as “CryEngine with Amazon services”.
[relatedpost limit=5 position=none thumbwidth=240 thumbheight=140 size=20 color=#666666 hovercolor=#FFFFFF]