Mikaze
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First few that come to mind for 3PP:
Cerulean Sea has a LOT of aquatic/amphibious races.
Races of Obsidian Twilight has some that may be suitable for a Dark Sun-ish setting as well.
Psionics Unleashed revisits the open source psionic-flavored races and introduces a new one, the Ophidians(near-human snake people).
On official races, the Bestiaries and the Inner Sea Guide introduce a lot of 0-level races: Tieflings and aasimar again, the genie-kin: Ifrit, Undine, Sylph, and Oread, shadow-touched Fetchlings, half-vampire Dhampir, I think the winged Strix may be 0-level but I'm not certain, Gillmen(which in Golarion come with some extremely restrictive flavor not all players will be happy with), and a few others I believe.
Sasha Greymantle
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Set
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In addition to the core and Bestiary races, from Paizo, you can find the the Suli, from Qadira: Gateway to the East and the Gillman and the Strix, from the Inner Sea World Guide.
Classic Monsters Revisited has some options for Kobolds and Goblins that might make them a bit more interesting than the Bestiary versions.