A quick look at the newly announced Lumberyard game engine from Amazon. This is based off the CryEngine from Crytek and is completely free with full source code for all developers. The only catch is, your server components either need to be hosted on your own servers, or on Amazons.
In this video, we look quickly at the install process, then take a quick tour around the engine itself.
Do let me know if you are interested in seeing more details on this engine.
Text version if you are interested:
An updated version is available here