Heh, some memories being stirred up there... both good and bad.
Mega System - bad, bad, bad game. Poorly translated from Swedish (? I think, not certain there) and printed by The Armory. Did I mention that it was bad? Well, it was.
Aftermath - the second post apocalypse game that I ever ran (1st ed. Gamma World was the first.) Very good in some ways, but character generation took less a long time, and dying was quick.
The Morrow Project - another post apocalyptic game, and very, very good. Not as cumbersome as Aftermath, but it still had plenty of ways to die.

Still in print I believe.
Firebreaks - an RPG (of sorts) printed by the U.S. government, you get to be the folks trying to advise the President in regards to a potential nuclear war. Kind of scary, in a dry sort of way. I wish that I still had my copy.
The Extraordinary Adventures of Baron Munchausen (A Superlative Role-Playing Game in the New Style by Baron Munchausen) - a great game, involving drinking, gambling, and competitive lying. An RPG that actually does have a winner. However, because the winner pays for the drinks some people play to lose.

This one really should come back into print.
Puppetland - you are puppets in a land ruled by the tyrant Punch, who has killed the Maker. Remarkably grim, and games are very short, lasting only an hour, no more. A shorter, original version is available in the archives of the designer's
website. written by the right reverend John Tynes, a print version came out from Hogshead Publishing.
1632 - A game that did not live up to my hopes. I like the setting, I like the period, but the system... not so much.
He Man and the Masters of the Universe RPG... the only reason I know of this one is that I knew the designers. Published by FASA.
Obscure enough?
The Auld Grump