By other settings I'm going to assume you mean "published specifically for BESM" because you can adapt this gem of a game to run anything and everything... Offical GoO settigns include the following, which presently set on my desk... They've got many, many more:
Centauri Knights
BESM Dungeon (think anime DnD)
Cute and Fuzzy Seizure Monsters (Pokemon type shows)
Hot Rods, and Gun Bunnies
Sailor Moon RPG&SB
Tenshi Muyo (OAV RPG&SB and both TV series UFG)
Demon City Shinjuku RPG&SB
Dominion Tank Police RPG&SB
Trigun UFG
Cowboy Bebop UFG
Hellsing UFG
Serial Experiments Lain UFG (although, I wouldn't try to run one)
The UFGs Ultimate Fan Guides, are basically rule-lite sourcebooks and info for various series that include a bit of game info. Normally stats for main characters, one or two new attributes, and a few pages of (normalyl well written) guidlines and suggestions.
The Roleplaying Game and Source Books (RPG&SB) were all standalone products published after the release of 1st Ed. and prior to 2nd Ed. BESM. They contain a heaping helping of sourcematerial, all the rules you need to play that game in BESM, and advice, guidelines and such.
GoO and the BESM started as a very, very small and low budget publisher and game. Although the core ruels have always been good, they've improved in quality a hundred-fold with the passage of time and with more money ^-^,
BESM 2nd Edition, Revisied (aka 2.5E) is a wonderful gem of a system. Yes, the problems addressed above are real, but the engine is incredibly easy to modify to suit your needs, and the fan base is strong, as is costomer support.