OpenERP

Whoa.  Open-source SAP replacement - and we all know what a profitable ecosystem SAP is!  This is open-source!

So ... gotta look at this in much more detail.

Update: And here is its slightly more scammy-seeming cousin VIENNA Advantage.  Apparently this one is built by a single company with what sure looks like a remote-control office (I am not free of this guilt myself, of course) who has reportedly opened their source.  If it's open access source, color me unimpressed, natch - and there are some textual weirdnesses on their cluttered front page as well that make me kind of wonder how serious they are.

But they exist.  And as such, they're data.

Update #2: dear Lord, their user interface is in Silverlight.