Kit Javali Solar - Velleman

This compact expansion board plugs directly into the GPIO header on a Raspberry Pi B+, A+, or Pi 2 and provides an easy and low-cost solution for driving a pair of small brushed DC motors. Its integrated DRV8835 dual motor driver allows it to operate from 1.5 V to 11 V, making it a great control option for low-voltage motors.

The MeArm Classic Maker Kit version is an easy-to-build Kit Robot Arm designed for kids and adults alike to learn about technology, engineering and programming. It was expressly designed to be easy to build (+11 years old) and easy to use. You can use any control board you like. It also gives you the freedom to use any type of arm control that will connect to your board, be it a joystick, keyboard, levers, or slider potentiometer. The only tool you'll need to build it is a hex wrench, and one is included in the box.