Everywhen, the 'generic' system based on Barbarians of Lemuria, has a bunch of 'setting books' allowing it to be used for 1980s/90s anime cyberpunk, weird Wild West, retro Cold War sci fi, modern military adventures, and so on. They're all pretty good, and while the included adventure is good for a couple of sessions, the additions/modifications to the rules in Everywhen (the equivalent to the BR:UGE book) are good for running extended games in those settings/genres.