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Linux

PalmPilot

ThoughtMill is similar to BrainForest. I don't see any references to any desktop clients.

http://www.handshigh.com/html/thoughtmill.html

Hi-Note is another similar program. It seems to have a little more emphasis on the leaf/note part of the tree and allows you to put drawings there too. There are desktop clients for PC and Macintosh.

http://www.cyclos.com/hi-note.htm