Here is a list of “Hackduino” kits, which are really just Arduino clones in minimally designed circuits.
Adafruit’s Boarduino
Solarbotic’s Ardweeny and Freeduino
Fundamental Logic’s iDuino and stickduino
The EAUduino
JeeLab’s JeeNode
Modern Device’s RBBB
Zach Hoeken’s Sanguino (uses a ATMega644P chip)
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