Arduino

The 8-bit board with 54 digital pins, 16 analog inputs, and 4 serial ports.

A kit with all you need to learn how to solder by building your own Arduino UNO and wave synthesizer shield.

ARDUINO LEONARDO W/O HEADERS
The Arduino Leonardo is a microcontroller board based on the ATmega32u4 . It has 20 digital input/output pins

The classic Arduino board that can act as a mouse or keyboard.

Arduino GIGA R1 WiFi. For ambitious makers with bigger ideas.