I'll put a plug in for Pelgrane Press. Their Gumshoe system is under a CC Atribution license - if you're looking to try a different game system that is still fantasy their Swords of the Serpentine game is one to check out - especially if you're more to the Swords and Sorcery pulp side of things than the dungeon crawling or epic fantasy. But Timewatch, Trail of Cthulhu, and Nights Black Agents are all also fun Gumshoe games. They also publish 13th Age for the fan of D&D that isn't D&D, which is currently OGL but I assume will be moving to a different open license.
(They also publish Owl Hoot Trail, which is a great little lightweight d20-inspired Fantasy Western game IMO. It's just a single book not a supported line but it's a hidden gem).
(They also publish Owl Hoot Trail, which is a great little lightweight d20-inspired Fantasy Western game IMO. It's just a single book not a supported line but it's a hidden gem).