We all know Arduino. There are a few models for the Arduino boards and the most known are the UNO, NANO, Mega and probably the pro mini. The one that EN msot uses for tests is the Arduino UNO board.
Now the Arduino board is an open source hardware. That means you could get the components and make yout own. This board uses the ATMega328 chip from ATMEL. What EN did was to create the abre minimum configuration for this chip, add the extra components such as the FDTI chip for progamming, the voltage regulators and a few more pins and order create a cool looking layout.
To order your boards, use PCBWay.com
and select yout color.