The Freedom of Fork

I sincerely can't think of Xorg too much as a fork sincerely, mostly 
because I haven't seen XFree doing anything in a long time. I was looking 
at forks that worked somewhat in parallel for a while at least. It's a 
bit like Ethereal and Wireshark, while technically a fork, the latter is 
considered more like a continuation with a different name.

For what concerns BSDs... they'd be worth a long article on their own, 
their history is quite contorted. Other names are missing, sure, like 
Wine and its derivatives, or OpenOffice and NeoOffice (on OSX). I suppose 
it could be a good topic for a series, looking deeply at the history of a 
specific project and its forks/children.