This is a 3.3V Arduino running the 8MHz bootloader, in a very small package - a Mini Arduino, you might say!
You need to wedge an Arduino into a really tiny spot? Simple - just use a SMD '328 IC. Oh... you want a reset, and voltage regulator too? Why didn't you say so!
This is LilyPad Arduino, the heart of a wearable electronics system! This main board features a ATmega168V preloaded with Arduino, and is ready to connect to a wide variety of wearable, sewable modules!
Looking for the smallest Atmel microcontroller with built-on motor drivers? The BittyBot MEGABitty microcontroller features an Atmel ATMega8L, motor drivers, and voltage regulation in tidy 0.9" x 0.9" package!
Simple target boards for ATtiny2313 microcontrollers and mini-development kits.
The Netduino 2 is an 32-bit open source electronics platform using the .NET Micro Framework with a rich development environment.