Until I get tired of doing it this way, Shock:Social Science Fiction, the literary SF RPG, is Pay What You Want Dollars for the PDF! The average payment is about $13, but you can give me any amount you want!
I’ve seen players use Shock: to make stories in the style of Kurt Vonnegut, Ursula K. Le Guin, Philip K. Dick, C.J.Cherryh, and Octavia Butler. It works with your group’s sense of humor for playing tragedies, comedies, and adventures, so long as they appreciate the irony that defines science fiction.
I do ask that you sincerely pay what you feel you can afford. Game publishing is my living and, while I’m very happy about every download, I can only make a living at it if you help.
Enjoy it, and may you never experience the vast and terrible worlds you create!