omnigraffle
curio
novamind
Inspiration(상용)
Nova-mind(쉐어웨어) http://www.nova-mind.com/
mymind(프리웨어-코코아) http://www.sebastian-krauss.de/software/
freemind(프리웨어-자바/오픈소스) http://freemind.sourceforge.net/wiki/index.php/Main_Page
Omni Outliner
pyramid