ListFonts is a project mainly written in Objective-C, based on the View license.
List available fonts in an OS X system
This tiny tool lists the absolute URLs of the available fonts. It requires at least OS X 10.6. The output is unsorted. Each line contains exactly one URL pointing to a font file. The URLs are encoded according to RFC 1738 and of the form
file://PATH#postscript-name=PSNAMEwhere PATH and PSNAME are the absolute file path and the PostScript name of
the font, respectively.