Excalibur  
   A free spell checker designed for LaTeX documents
   http://www.eg.bucknell.edu/~excalibr/excalibur.html

TeXShop  
   Freeware GPL'ed graphical front-end for teTeX under Mac OS X.
   http://www.uoregon.edu/~koch/texshop/texshop.html

Mac OS X TeX Mailing List Archives  
   Indexed by date and thread.
   http://www.masda.vxu.se/~pku/MacOSX_TeX/

MacGSView  
   A graphical interface for Ghostscript, a PostScript previewer. Downloads.
   http://www.cs.wisc.edu/~ghost/macos/

MacGhostView  
   A general purpose PostScript and PDF previewer based on Ghostscript. Presentation, news and download.
   http://www.kiffe.com/macghostview.html

iTeXMac  
   A text editor, a PDF viewer and a teTeX frontend. News, presentation, screen shots, download, FAQ, mailing lists and bug tracking.
   http://itexmac.sourceforge.net/

BibDesk  
   A graphical BibTeX bibliography database manager for Mac OS X.
   http://bibdesk.sourceforge.net/

Geek Notes  
   Blog especially on Mac OS X and LaTeX.
   http://semantics-online.org/geek/

LaTeX and Mac OS X  
   General information about TeX and LaTeX, and OS X specific information.
   http://latex.yauh.de/index_en.html

XeTeX  
   A freeware typesetting system based on a merger of Donald Knuth's TeX system with Unicode and Mac OS X font technologies.
   http://scripts.sil.org/xetex