A few helpful wikis for fantasy & sci-fi writers (for some of what’s out there) and gamers:
http://aliens.wikia.com/wiki/Alien_Species_Wiki
http://fantasyraces.wikia.com/wiki/Fantasy_Races_Wiki
http://fictionalraces.wikia.com/wiki/Fictional_Races_Wiki
http://en.wikipedia.org/wiki/Category:Lists_of_legendary_creatures