arduino Nano V3.0 ATmega328P 5V 16MHz CH340C Type C

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 leonardo r3 atmega32u4

Transparent Acrylic Case Shell For MEGA 2560 R3

CH340G nano V3.0 R3 Board

On the latest clones of Arduino models, The CH340 usb - serial converter chip has been used instead of Atmega 16u2 of the FTDI chip.  

Transparent Acrylic Case Shell For arduino uno r3

Arduino Atmega32U4 pro micro

LilyPad USB - ATmega32U4 Board microcontroller development board

ARDUINO UNO R3 ATmega328P ATmega16U2