Up to RPG
& when I say “Traveller”, I generally mean “classic Traveller”. Sometimes abbreviated “cT”.
Top 10 things to know about classic Traveller when I’m ref
Aptitudes: What characteristic scores give DMs for each career?
A summary of CT self-improvement
Far Future: Marc W. Miller’s company. (MWM is the creator of Traveller.) Sells Traveller5, the latest edition, and cT reprints as well as reprints of other GDW products.
BeRKA has a map of the Spinward Marches as well as individual subsector maps & world data on his Zhodani Base site.
Citizens of the Imperium forums: Forums for discussing Traveller in all its incarnations. Hosted by QLI/RPGRealms.
GURPS Traveller: Steve Jackson Games publishes a GURPS version of Traveller. (Sometimes abbreviated “GT”.) Some of the supplements can be used with CT.
Mongoose Traveller: Abbreviated “MgT”. (“MT” is Megatraveller)