Real time editing, bump mapping, dynamic lights, network system, integrated physics system, shaders, shadows and a dynamic music system are just some of the state of-the-art features the CryENGINE™ 2 offers.
Stunning graphical engine. Crysis is still super good looking after 3 years. First I thought Far-Cry 2 uses this engine, but apparently it doesn't, since it's not Crytek. It's only Crysis and Crysis Warhead that uses this engine, that I know of.