Level 80
- Contains various hints for the game.
- http://www.level80.co.uk/psun.htm

Elfwood FanQuarter: fan art by Sarah Guilbeaux
- Um Jammer Lammy fan art drawn by Sarah Guilbeaux. Mostly pictures of Teriyaki Ono, with a few of Lammy, Rammy and Parappa.
- http://elfwood.lysator.liu.se/fanq/g/u/guilbeaux2/

Anime Lyrics: Um Jammer Lammy lyrics
- Lyrics from the "Make it Sweet!" album, most of which come from the game itself.
- http://www.animelyrics.com/game/umjammerlammy/

Neoseeker's Um Jammer Lammy Resources
- Offers FAQs, screenshots, a discussion board, and links to reviews.
- http://www.neoseeker.com/Games/Products/PSX/umjammerlammy/umjammerlammy_cheats.html

Whimsyload
- Artwork by game artist Rodney Alan Greenblat
- http://www.whimsyload.com/