Dopefish
Dopefish Webring, Dopefish.com, Justin's Really Keen Page - Dopefish Division, The Dopefish Screen Saver
3D Realms: A Look Back at Commander Keen
The history of Commander Keen, includes photos, and screenshots.
Cerebral Cortex 314
Information, screen shots, downloads, an ASCII art section, level editor, and level sets for Keen 1.
Commander Keen Fan Site
Includes information, screenshots, downloads, cheats and links.
GameSpot
Frank Provo reviews the Game Boy Color version. Includes screen shots and passwords. Score: 6.8 out of 10.
Justin's Really Keen Page
Includes downloads and a list of where all the 1UPs in the games can be found.
Keen Galaxy
Offers downloads, online games, episode guide, music, cheat codes, maps, and installation guide.
pocket.ign.com: Keen!
Offers rumours about a possible version of Id Software's Commander Keen game for the Game Boy Color.
S&F Prod
Cheats, sounds, links, and downloads.
The Commander Keen Web Page
Offers cheats, hints, pictures, downloads, and guestbook.