The Commander Keen Wiki
- Fan-maintained reference to the entire Commander Keen universe, including mods and fan made games.
- http://www.shikadi.net/keenwiki/

Can't Get Enough Commander Keen
- Including character lists, cheats, and hints.
- http://www.al-morrin.co.uk/samira/keen/index.php

Beyond the Pogo
- Offers fan art, newsletter, encyclopedia, and editing tools.
- http://spatang.com/ck/

GameSpot
- Frank Provo reviews the Game Boy Color version. Includes screen shots and passwords. Score: 6.8 out of 10.
- http://www.gamespot.com/gbc/action/commanderkeen/

Commander Keen Fan Site
- Includes information, screenshots, downloads, cheats and links.
- http://www.commander-keen.com/

3D Realms: A Look Back at Commander Keen
- The history of Commander Keen, includes photos, and screenshots.
- http://www.3drealms.com/keenhistory/

pocket.ign.com: Keen!
- Offers rumours about a possible version of Id Software's Commander Keen game for the Game Boy Color.
- http://pocket.ign.com/articles/082/082671p1.html

Cerebral Cortex 314
- Information, screen shots, downloads, an ASCII art section, level editor, and level sets for Keen 1.
- http://www.classicgaming.com/cc314/