Traveller Bibliography:
http://www.travellerbibliography.org/
Here are all known Classic Traveller related products.
Yes = owned at least 1 product
Game Designers' Workshop- Yes
Ad Astra- Never heard of them
Adjutant- Never heard of them
Avon Books- Yes
Ba'Rac Limited (software)- Never heard of them
Baron Publications- Never heard of them
Cargonaut Press- Yes but only a few years ago; was located under a mile from my house
Chaosium, Inc- Yes
Citadel Miniatures- Never heard of them
Digest Group Publications- Yes
Disenos Orbitales, SA- Never heard of them
Fantasy Productions (German)- Never heard of them
FASA- Yes
FFE Collectors' Edition- Yes
Gamelords- Yes
Game Science- Yes
Games Workshop- Yes
Grenadier Miniatures- Remember them
GRiP: The Traveller Edition- Remember them
Group One- Yes though I thought was same as Judges Guild
Hobby Japan- Never heard of them
Hobby Products Miniaturen (German)- Never heard of them
Judges Guild- Yes
Juggernaut Press- Never heard of them
Loner Enterprises (Jordan Weisman)- Never heard of them
Marischal Folio Adventures- Yes
Martian Metals Miniatures, 15mm- Yes
Paranoia Press- Yes
Phoenix Games (n.a.)- Never heard of them
Reilly Associates (n.a.)- Never heard of them
Roll-For-Your-Life- Never heard of them
Seeker- Never heard of them or so uninteresting forgot I did
Star Quest Games- Never heard of them
Starman Adventure Systems- Never heard of them
Star Quest Games- Never heard of them
Steve Jackson Games- Yes
Supernova Games- Never heard of them
Warfield Games- Heard of it but never able to acquire it.
Zocchi Dice- Remember them.
So of 39 publishers I owned product of 14 and had heard of 4 others of which only 1, Warfields Evening Star, was wanted by me. In those pre-internet days getting the word out was much more difficult than now, if JTAS didn't plug your product you were hard pressed to get that knowledge out.