For me at least, it has to be open source. We have about 20 developers working on different platforms, but a common infrastructure to ease programming, fd/hd access etc.
It'll all be pushed to the website shortly, once it is stable enough - and we are nearly there.
I'm selling the hardware, so in that sense it's commercial, but everything else is for fun so to speak.
I developed the hardware platform I wanted to write stuff on

/Mike