The Rending of Palaghast
All of the standard D&D races are available. Legend says that they all descend from The People, but with the Rending and the introduction of Magic from the Being From Beyond, they all undertook transformations into the races of today.
Rumors circulate that The People still exist, but are truly twisted (Orcs, Drow, and other denizens of Pala-Morto).
Of those races not in the standard PHB are the races included in Elemental Evil with some minor changes.
The Noble Races
Abyssal Touched (Genasi)