Never played Traveler (although I heard of it), but I was really into star frontiers! My group got through most of the volturnous modules, only playing 1 hour a day during lunch in school.
Thanks for reminding me about Star Frontiers desdinova! I have been lurking on this forum forever, partially because I couldn't think of a name. Now I have one
In retrospect, Star Frontiers was not that great of an rpg system. GURPS is a much better thought out system. I sort of wish someone would license and write the core rules (at least the charager building, skills, and combat system) into a game engine...