NetBeans is quite possibly the best free php editor on Mac OS X. NetBeans provides a host of features including syntax highlighting, project support, code navigation, unit testing, and code completion. My favorite part of the code completion is support for all classes in your project. Thus, it makes using a PHP framework a lot easier. It also has project templates for a lot of popluar frameworks. [link]

TextWrangler is another great free PHP editor for OS X. With support for FTP and SFTP along with syntax highlight and and very nice find and replace feature, TextWrangler provides enough power for everyday use on your sites.

Aptana provides a great all around PHP IDE that is built on the Eclipse framwork. This is a great IDE, and provides FTP/SFTP support was well as syntax highlighting, debugging tools and a host of other features. However this is moved down on the list because of their recent news: “Aptana PHP is no longer included in Aptana Studio 2.0, and only PDT will be supported going forward. Developers who wish to continue using Aptana PHP should continue using Studio 1.5.x.”

Smultron is a very simple PHP editor. It isn’t made for large projects or where you need to run PHP unit test or debugging. Smultron, is something you would use for everyday quick edits of code. It does support multiple files, syntax highlighting, and I really like their simplicity but still providing some decent power as a editor. Snow Leopard is also supported in their beta release.

jEdit is another simple PHP editor. It does provide syntax highlighting as well as FTP support (via plugin) and it offers unlimited undos/redos, auto indent, and some really nice plugins. It is looking a bit oudated compared to some of the other editors in this list, but it is very stable and runs on Java.

If you are not looking to spend any money these are some great IDEs to get help with your workflow. If you are looking to spend some money for a editor, try looking at Espresso or Coda. If you have any suggestions please post them below.