In the early days of the science fiction RPG Traveller, the universe was not so fleshed out. All we really had were the three little books GDW put out that contained a lot of information on how to play the game but scant information about the universe the game was played in.
In a way, that was good. Players and referees alike had a lot of latitudes to invent their own worlds and settings. And invent we did. The rules of Traveller were not conducive to simply cut and paste Star Trek or Star Wars motifs so one was forced to get creative. However, as cool as that was it was also a lot of work and sometimes you just want to throw down and roll some dice. Enter: Gamelords LTD’s “A Pilot’s Guide To The Drexilthar Subsector.”
Gamelords LTD was one of the many small publishing houses that created supplements under license for GDW. A Pilot’s Guide To The Drexilthar Subsector was one such effort. Within this 48 page booklet, were the details of a single subsector just on the edge of Imperium space. Each of the 27 worlds within was detailed with enough information to form an adventure but still left lots for the imaginative Referee to do his/her own thing.
Personally, I found it the ideal setting for numerous Traveller campaigns. In fact, my well-worn copy is still in my possession after 30+ years of gaming. You can still get a copy today at Drive Through RPG at: https://www.drivethrurpg.com/product/60313/CTG-A-Pilots-Guide-to-the-Drexilthar-Subsector
Traveller has inspired me for decades and I don’t apologize for the similarities one might find to it in my own science fiction writing. I hope you enjoy.