- A bunch of boards by Fundamental Logic which apparently stopped accepting orders in May of 2010. That makes me sad since they offered some interesting boards, but thankfully the designs are still online for reference. My favorites: iDuino, StickDuino, MPGuino.
- Modified Pico was a very compact, breadboard-friendly Duemilanove-compatible board. Thankfully details (including design files) are still available.
- Rampage Robot Base V4 was an Arduino-powered robot platform with headers for a shield. Looks like its creator has moved on to more complex microcontrollers.
- Zuccherino by Evil Mad Scientist Laboratories was to be "a low-cost, scalable, and extremely versatile open-source motion control platform," but the project has not had an update in a while. I look forward to more from this project.
- "Flexi" was an inexpensive breadboard-friendly clone, not sure what happened but the domain now hosts a useless/spammy link page.
- I just added a "By" column for designer, author or manufacturer. I'd like it to be simply "Author," but some companies [cough] mostly sell other peoples' designs, so I'm not sure whom to credit.
- I'd like to add more information about when boards were edited or checked, but wading through the revision history in Google Docs is a pain. A few people have suggested this and I like the idea, but I can't figure out how to track down the details.
- I updated a bunch of boards' links, prices, and chip; a few use ATmega328s but used to be ATmega168s.