CamJam EduKit 3 motor controller board
This motor controller board is part of CamJam EduKit 3 - Robotics but is also available separately from The Pi Hut. It provides two motor outputs for 6V motors using a DRV8833 H Bridge and breaks out most of the unused pins to a female header on top of the board.
Pins that are broken out to the header are as follows: 5v, 3v3, SDA and SCL (for I2C devices), 4, 17, 18, 22, 23, 24, 25, 27, and Ground.
The board expects 4 AA batteries to be used to power the board, although it will accept up to 10V if you have more powerful motors available. A flyback diode is provided to protect your board and Raspberry Pi if you should accidentally wire up the power source the wrong way around.