Grove Pi & Base Kit
GrovePi helps you build your own smart devices. The Base Kit includes the GrovePi board and 12 Grove sensors so you can build anything from a weather station or plant monitoring station to a MINECRAFT controller or automated rain notifier. Raspberry Pi sold separately.
The perfect little add-on to drive motors, make sounds, and learn how to interface electronics with your Pi. Invent programs
Use PiStorms to make LEGO Robot with Raspberry Pi Brains! Works with Raspberry Pi A , B , Pi 2 & Pi 3
Arduberry works with Arduino & the Raspberry Pi, a powerful little computer. It allows you to access lower level functions on Arduino shields for more precise control.