Ethernet shield (with POE module) allows an Arduino board to connect to the internet
The Mega Sensor Shield v.2 allows you to hook up the TinkerKit SENSORS and ACTUATORS directly to the Arduino Mega or Mega 2560 or Mega ADK, without the use of the breadboard
Arduino Prototyping Shield Kit makes it easy to design custom circuits for your next Arduino project
Arduino TinkerKit starter kit is a pack of different TinkerKit Modules, aimed to start designing interactive environments / prototype interfaces without using the breadboard or the soldering iron.
Arduino TinkerKit Mega Android is a pack of different TinkerKit Modules, aimed at developing applications for the Android mobile platform
MEGA Proto Shield Kit Rev3 allows you to move your projects from the breadboard to an Arduino MEGA-compatible PCB
The MEGA Proto Shield Kit Rev3 allows you to move your projects from the breadboard to an Arduino MEGA-compatible PCB