Lego Wedo
http://www.legoeducation.us/eng/categories/products/elementary/lego-education-wedo
http://info.scratch.mit.edu/WeDo
Picoboard / Scratch Card
http://wiki.scratch.mit.edu/wiki/PicoBoard
http://www.picocricket.com/picoboard.html
Arduino / Scratch for Arduino
http://arduino.cc/ / http://s4a.cat/
Kinect to Scratch
http://scratch.saorog.com/
—
Makey Makey
http://www.makeymakey.com/
—
Litle Bits
http://littlebits.cc/
Mindstorms
http://mindstorms.lego.com/‎
Ollo
http://www.robotis.com/xe/ollo_en
—
Ro-Botica
http://ro-botica.com/