Adafruit manufactures a wide variety of Arduino compatible microcontrollers. The Metro is Adafruit’s version of the Arduino Uno with a few minor improvements including a hardware FTDI chipset for USB communication and an integrated power switch. The Feather is a lineup of purpose built microcontrollers designed with battery power and mobility in mind. Trinkets are a small, low cost, no frills microcontroller. The Gemma and Flora are designed specifically for wearable applications.