There is some attempt to draw the relations in http://commons.wikimedia.org/wiki/File:Unix_history-simple.png http://commons.wikimedia.org/wiki/File:Unix_histor

There is some attempt to draw the relations in http://commons.wikimedia.org/wiki/File:Unix_history-simple.png http://commons.wikimedia.org/wiki/File:Unix_history-simple.p... FreeBSD is the main current source of stuff, but NextStep is much older.