Interface breakout boards
Bus Pirate - v3.6a acts as an interface that transmits data/information and it also has the ability to control micro-controllers.
SparkFun Serial Basic Breakout - CH340G is similar to the FTDI basic breakout that is a USB to serial adapter.
EZO Carrier Board acts as a interface between your Atlas scientific kit and your computer or the Raspberry Pi 3 board.
This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 2.1W channels into 4 ohm impedance speakers (@ 10% THD).
LP55231 LED Breakout is an Led controller that controls a series of RGB'S and is best suited for variable intensity and colour mixing applications.
Sparkfun Load Cell Amplifier breakout board is precise and accurate ,reads data from load cells to measure weight.
Using only two pins, control 16 free-running PWM outputs! You can even chain up 62 breakouts to control up to 992 PWM outputs (which we would really like to see since it would be glorious)
HDMI Plug Breakout Board is a light weight ,less expensive breakout board.
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.
PROTOCENTRAL U2U BRIDGE (FTDI 230X) acts as a bridge to convert USB to UART.
SparkFun Analog/Digital MUX Breakout - CD74HC4067 is a great way to connect multiple sensors even upto 16 sensors