[Pfiffer]

Notably this is the same person behind InterimOS[0], which is a from-scratch OS targeted at the raspberry PI.

0: http://interim-os.com/

[unkown-unknowns]

That link has an interesting write-up which includes a story about a computer he made himself using a micro-controller and then it goes on to talk about making the OS for the Raspberry Pi and also has some criticism of the Raspberry Pi. Would recommend reading.