The Zak McKracken Archive: News, FAQ, user guide, screen shots, walkthrough, in-game jokes, and fan-made sequels.
UHS Hints: Universal Hint System hints by Jason Strautman.
Zak McKracken and the Alien Mindbenders: Fan fiction.
Zak McKracken and the Alien Rockstars: Fan project to develop a sequel to Zak McKracken.
Zak McKracken between Time and Space: Fan project to develop a sequel to Zak McKracken.