Chewbacca appears in the third book of the Origami Yoda series, The Secret of the Fortune Wookie (in origami form) and in some of the subsequent books of the series.
In Star Wars Jedi Knight: Jedi Academy, Chewbacca appears briefly at the Mos Eisley spaceport as an NPC, assisting Jaden Korr in disabling the tractor beams holding both the Millennium Falcon and the Raven's Claw captive [REF].