GURPS Traveller (1998–present) was "Created on a handshake with Steve Jackson of Steve Jackson Games."
The game uses the GURPS (Third Edition) system and takes place in an alternate timeline in which no Rebellion occurred and the AI Virus was never released. Steve Jackson Games produced numerous supplements for the line, including details for all of the major races, many of the minor races, interstellar trade, expanded world generation, the military forces of the Third Imperium, and starships. The game is often referred to as "GT".