Raspberry Pi Prototyping Accessories
ProtoPi T with USB Serial Access is an add-on to the breadboard as it allows you to play with all the GPIO pins
Proto Pi T bridges the gap between the Raspberry Pi3 and the breadboard.
Adafruit Capacitive Touch HAT for Raspberry Pi - Mini Kit - MPR121 consists of 12 touch reactive sensors that react at one time.
This is a Mini Real-Time Clock module, it design for Raspberry Pi, but it also can be used to Arduino.
GrovePi is a system that brings Grove sensors to the Raspberry Pi.
Our friends over at LinkSprite have made this nifty little RS485 Shield for the Raspberry Pi, now you will be able to have a communication port for your field bus directly connected to your RPi!
Now that you've finally got your hands on a Raspberry Pi® , you're probably itching to make some fun embedded computer projects with it. What you need is an add on prototyping Pi Plate from Adafruit, which can snap onto the Pi PCB (and is removable later if you wish) and gives you all sorts of prototyping goodness to make building on top of the Pi super easy