BLAH BLAH TRANSITION TRANSITION ELEGANT CONVERSATIONAL SEGUEWAY
...the Traveller-specific sci-fi version of FLAILSNAILS is called STARSLUGS and, as of last night, is fully operational--we did indeed successfully kill Astrozombies from The Galaxy Of Fear with a Astrogrenade From The Space Cantonment.
That is: Evan died in Chris's Classic Traveller game but in the process inadvertently enabled us to get our hands on weapons Chris' party then used against the monsters in Evan's Mongoose Traveller game.
Original Traveller supports a build-what-you-like setting and a simple 2d6-roll-high system with all the usual space-suspects for skills and so is so generic so I'm having a hard time thinking of any reason you shouldn't just bolt any old sci fi game you happen to have lying around onto it and start running games for any space pirate who wants to roll up.
There are probably people who'll tell you Traveller is a poor fit for yyy setting because themes or something, but people who say stuff like that are usually wrong about everything and have ugly children or smell bad or both and are far too defeatist for the gaming life.
So let's see your Star Wars, Warhammer 40k, Carcosa, Mekton, Gundam, Gigacrawler, Stars Without Number, Cthulhutech, Eclipse Phase and Dr Who STARSLUGS games--rolling 2 is bad, rolling 12 is good, rolling 7 is average and...that's all you need. So get on it like yesterday.