scottie on 12 July 2009
I would suggest
Gamebryo engine for its versatility and sheer number of top quality titles (Empire Earth 2 and 3, Civ 4, fallout 3, Elder scrolls 4, Warhammer online, Sadness and much more)
SAGE engine for producing some of the best modern RTS (LOTR BFME 1 and 2, and some C&C games)
Anvil (Scimitar) is also good, and has been used in Assasins Creed, Prince of Persia, shaun White and AC2
