Traveller: 2300 portrayed humans as technologically advanced, but having a level of civilization not very far above the present day.
Later publishers introduced additional material along the Official Traveller Universe timeline.
In 2008, Mongoose Publishing reintroduced GDW's popular look and indexing feature separating publications into familiar Books, Supplements, and Adventures.
The subsequent books presented additional rules on specific subjects, expanding on Traveller's basic concepts.
[2]: 162 Supplements provide different types of data, including starships, starsystems, characters, and animals in pre-generated form.
[4] Short presentations on specific topics, originally appearing in the Journal of the Travellers' Aid Society (JTAS).
[4] Each introduced a new alien race to players and referees, complete with character generation, history and background, language material, and an adventure.