"Roleplaying in Alan Dean Foster's "Humanx Commonwealth" "
"Man's Best Friend is a Bug!"
GURPS sourcebook detailing 28 worlds of the Humanx Commonwealth. Includes rules for playing nine alien aces, basic rules for psionics, complete stats for several characters in the series, and equipment from the novels. Also has a mini adventure.
Humanx was the first GURPS true science fiction sourcebook and as such was a precursor to GURPS Space.