Truckee Games offers 17 full game worlds (and growing!), and 5 one-page game worlds, all for use with Risus. But honestly, Risus is so dirt simple, they are easily ported over to your game of choice.
Links on the side take you to downloadable documents and supplemental material.
Axe, Hammer, & Rune: Dwarven warriors do battle with Goblins to retake the ancestral homeland, while avoiding saboteurs at home who would rather certain secrets remain buried.
Brave The Impossible: Victorian age steam-punk in the aftermath of a Martian invasion. Secret societies abound as humanity reverse-engineers Martian technology, and the question remains...did the invasion end, or is it just beginning?
Call of the Wild: Half-human, half-animal, tribes of people fight to survive the ruins of civilization, each other, and the monstrous Shadow that lurks everywhere.
Chumahassee County: Somewhere in the deep south, in an unnamed state, exists Chumahassee County. It is a place where town folk, inbred hillbillys, aliens, bigfoot, cannibal killers, and every other gonzo idea exist side by side...often with hilariously offensive results.
Conquering the Wyrm: In the Egyptian afterlife and in the land of the living as mummies, heroes do battle with the serpent god, Apep, and it's minions, to preserve order...or face final and ultimate oblivion.
Destroyer of Worlds: An epic sci-fi spiritual saga of a people who are born, die, and are reborn over thousands of years, and keep making the same mistakes.
The Devil Is: Gangland horror in the early 20th century, but is the horror man-made or from the Devil itself? Is it real, imagined, or have you gone insane? Time will tell, if you live that long.
Full Contact Magic: Full Contact Magic is a fantasy themed setting replete with elves and dwarves and halflings...but also a myriad of other races to play, and magic, and then there are magical mecha and tanks, and moons full of monsters. Confused? You'll figure it all out soon enough.
Future Imperfect: Long after the last human was born, sentient robots attempt to find a way to resurrect humanity and save themselves as they too face extinction in an increasingly dangerous world.
MechaPocalypse: A mecha-filled post-apocalypse. An intimate look at a semi-functioning society in the ruins of Los Angeles.
Nightwatch: Skeleton cops patrol their skull shaped world on the lookout for flesh covered zombies, while worrying if they will be able to make the mortgage payment on their house.
Obedience: Obedience is a near-future dystopian/utopian setting that realizes the worst of fears from the modern political climate with heaping helpings of snark.
Scairy Tales: An apocalypse has come to the world of fairy tales, but to survive, Folk must start to believe in their own stories...and create new ones.
Strange Gods: Humans wielding magic, and extra-dimensional beings with magic bloodlines find themselves in battle with and against each other. Some call them Super Heroes. Some call them Super Villains. Most call them, Strange Gods.
Terra Mutant: Part science, part fantasy, but all apocalyptic wackiness. If you like TSR's Gamma World, you'll like Terra Mutant.
Timberpunk: Lumberjacks explore and make a living from a mysteriously forested continent while avoiding death at the hands of rival companies, bandits, natives, and the horrific spirits that haunt the forest.
We The People: The American War of Independence rages
on, while a secret war waged between Freemasons and the Illuminati
determines the fate of nations and the right to use magic.