Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language.  

Arduino Nano 33 IoT with headers

ARDUINO YUN REV 2 ABX00020 ATmega32U4 Development Board

ARDUINO UNO WiFi REV2

Arduino DUE 2013 (ARM 32 BIT- Cortex M3)

arduino leonardo r3 atmega32u4