3D Realms: A Look Back at Commander Keen: The history of Commander Keen, includes photos, and screenshots.
Beyond the Pogo: Offers fan art, newsletter, encyclopedia, and editing tools.
Can't Get Enough Commander Keen: Including character lists, cheats, and hints.
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.
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.
The Commander Keen Web Page: Offers cheats, hints, pictures, downloads, and guestbook.