NoteTaker. For MAC (and Java) JReepad Jreepad is an open-source re-working of Treepad Lite in Java created by Dan Stowell.
Jreepad is freeware. JReePad comes in two editions: (1) a dedicated MAC OS X edition, and (2) a Java edition which runs on any operating system, but needs to have a Java virtual machine installed. Screenshot of Jreepad running on MAC. Luvly: Lion Kimbro on wiki, notebooks, and the public web.