There are very few such corporations, for a variety of reasons - not least of which is lack of start-up funding and general hostility from the ownership class, with lack of material ambition possibly running a close second.

It's likely that someone as persistent and annoying as Richard Stallman is going to have to invent an OpenBusiness model, and spend all their time promoting it.

Chris Cook has one model for this, but from what I've understood of his ideas there's no explicit commitment to worker participation and democracy.

I expect there are alternatives, but I haven't spent enough time researching this to know what they are, or how they work.