I use markdown extensively on my websites, “Markdown” is two things: (1) a plain text formatting syntax; and (2) a software tool, written in Perl, that converts the plain text formatting to HTML allowing you to build HTML documents in an easily readable form. As the use of Markdown has increased in popularity there are now a wide choice of plain text/Markdown editors available for MacOSX and recently iOS so I’ve updated the listing of Markdown Editors.

The latest addition is CotEditor an open source text editor designed specifically for Mac OS X. There is syntax highlighting for 40 different languages, and it is scriptable using Python, Ruby, Perl, PHP, UNIX shell or AppleScript (and even JavaScript on Yosemite). It also contains a find and replace using regular expressions.