I really like EABA. I was less enthralled with the 2nd Edition. While the idea of the expanding combat scale seems nifty enough (where each round in combat is twice as long as the one before it) in practice it just seemed to break everybody's brain so we didn't stick with it more than a couple sessions.
I also have 2nd edition but haven't done more than read through. I remember the doubling combat rounds - I think it was trying to give a game-mechanic base for a cinematic development of the type of action that was happening, from blow-by-blow on up to more extended and elaborate effects. It was a nice idea but I could imagine it falling to bits in play.
Here's a couple more:
StarCluster from Clash Bowley - now up to 4E I think, but I only have 2E and 3E. 2E was a pretty confusing percentile system and 3E had a bunch of different dice resolution mechanics that you could plug in, depending if you wanted a swingier mechanic or preferred dice pools or whatever. The rules would say such and such item or trait gives you "an advantage" which would mean something different depending which mechanic you were using.
Anyway the best thing about it was the default setting. Humans on generation ships fleeing the destruction of Earth arrive in a Starcluster already peopled by a bunch of aliens and by three humanoid species that I think were descendants of primates lifted off Earth by ancient aliens (I might be misremembering). Some of the Earth humans get together with the three indigenous humanoid species in a mostly-nice-but-don't-mess-with-us federation while some other humans split off into a more species-phobic coalition. The Thieves' Guild were a third faction which was barmy for a space opera setting, but I could just about live with it. I remember not much liking the aliens though - some of them were Dr Moreau style mashups of Earth animals. SC2 had a detailed starmap whereas SC3 had a roll-your-own-setting guide that worked like SWN traits.
Normal Traveller style space opera hijinks can ensue although the feel I got off the books was more Iain Banks than Dumarest.
Nebuleon by Hinterwelt - another SF space opera offering. I barely remember the system mashing up D20, Rolemaster and BRP into an unholy mess that I would not touch with a 10' pole. But again I really liked the setting. There were multiple alien species. Humans were the galactic underclass with no known homeworld, which is both a nice twist versus most settings, and puts the PCs on the back foot from the off (assuming they are human). A previous empire had collapsed after the ruling species was decimated by a plague, although they were still around and quite powerful, and in a somewhat adversarial relationship with the new boss empire. The aliens were cool - there was a race of pharmaceutically inclined tree sloths, and a theocratic species that delegated alien contact to a sort of unclean caste. The new empire were a bit less original, big-cat aristocratic warriors. The old empire were mostly too scared of plagues to leave their world so hired aliens to serve in a kind of foreign legion, which makes for a nice campaign premise. I started a campaign with the setting in BRP using various monster stats reskinned for the aliens, but sadly it didn't last. I would love to see a new version using a current system like Traveller, SWN or Mythras.