Composer SE : FAQs : NVU Mac OS X
The following article is deprecated, as official builds for the Mac OS X can now be downloaded along side those for other operating systems, here:
Currently, there is no "official", precompiled version of Nvu available for the Mac OS X.
There is however, a third party, that has compiled a working version of the current release (0.3, as of the current edit) for the Mac OSX 10.3 "Panther".
A compiled, bzip compressed binary can be found here.
Additionally, Tips for successfully compiling one's own version of NVU for the Mac OSX can be found here.
Nvu 0.70 has been released for the Mac OS X.
See the announcement: