werkkzeug was used for creating kkrieger. It has been on slashdot a long time ago. In bitjam 39 boyc of Conspiracy mentions that werkkzeug started a revolution in the demoscene.

I used to play with lego bricks myself when I were young, and these
days 15 years later, I have returned to my roots, and is working on
a graphics program that uses this idea, but limited in 2 dimensions.
Its kind of a .werkkzeug clone for Mac. Still alpha quality.
http://toolboxapp.com/

The people that has made .werkkzeug is a team named farbrausch.
They have made some incredible things, such as .kkrieger a 96k FPS.
This is a great tribute to lego bricks. From a programming view point
its some really challenging the stuff these guys are doing.
http://en.wikipedia.org/wiki/.kkrieger
http://en.wikipedia.org/wiki/.werkkzeug

The lego brick idea are probably also used elsewhere in the software world?

Anyways, this thread is about hardware and the bricks in TFA are nice.