These are Scratch programs for use with the Lego WeDo robot kit.
WeDo comes with its own software, but can also be controlled from within Scratch. You can make robots that move in response to instructions from the computer, and respond to their environment using the WeDo distance and tilt sensors.
The studio now contains code for all 12 official Lego models that can be built with the WeDo base set, plus a few of my own inventions.
I am using the WeDo robots as part of my Code Clubs in Newcastle upon Tyne, UK.