Traveller definitely is the OD&D of sci-fi
I never thought a scifi game would inform my OD&D game, but damned if it hasn’t.
OG Traveller is on the bucket list of games I desperately want to play.
You might like
Battle Born, Original https://www.drivethrurpg.com/product/249220/Battle-Born-Original
Designing Sci Fi Scenarios https://www.drivethrurpg.com/product/249223/Designing-SciFi-Scenarios
Encounters Sci-Fi Scenarios https://www.drivethrurpg.com/product/249225/Encounters-SciFi-Scenarios
Independetns of the S&R Group https://www.drivethrurpg.com/product/249229/Independents-of-the-SR-Group-Era-Ten-Supplement
Guardians of Sol https://www.drivethrurpg.com/product/249227/Guardians-of-SOL-Era-Ten-Supplement
OG Traveller influenced these games that came out in Space Gamer Magazine in the 90’s
