Attiny microcontrollers are smallest microcontrollers from AVR line. Despite their low pin count and less memory, they are great microconrollers for smaller projects. In order to make thing simpler, Ben built a Chipper board that makes it easier to program and prototype tiny’s.
It is made to be Arduino shield compatible. So by stacking it on top it already can be used as second core if you wish. Chipper board supports majority of tiny micros with 8, 14 and 20 pins. Board has couple LEDs and sensor port for fast prototyping. There is also a small prototyping area to make custom addition to it.