FONZO  Again me. It's now more than 9 month since we saw an update for this app. There is plenty of room for improvement. It is really disappointing to see, how this application is neglected by its developpers. C'mon boys, wake-up!  
(Version 2.2)

PEDROTAQUELIM  I like this one to:

http://osx.iusethis.com/app/cmaptools  
(Version 2.2)

RPPHOTO  Takes a long time for significant updates, but when they come, wow! Very nice new features for one of the world's most stable and useful Mac apps!  
(Version 2.2)

FONZO  This is a solid application. Unfortunately it hasn't evolved for quite some time now, thought there is plenty of room for improvements. Hope they get this back on track.   
(Version 2.1.2)

HERVé 5  There is also the free and beautiful MyMind at

http://www.sebastian-krauss.de/software/

http://homepage.mac.com/sebastian.krauss/mymindscreenshots/  
(Version 2.1)

UMAROMC  This looks to be a solid application for what it claims to do [for the end user] and for not too bad a price.

FreeMind (http://www.macupdate.com/info.php/id/19325), though, offers much of the same functionality at the unbeatable price of free.  
(Version 2.1)