Quoted from: http://smultron.sourceforge.net/

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Smultron is a free text editor for Mac OS X 10.4 Tiger which is both easy to use and powerful. It is designed to not confuse newcomers nor disappoint advanced users. It has all the advantages of an Cocoa application and some of its features are tabs, line numbers, support for syntax colouring for many different languages, functions list, support for text encodings, snippets, a toolbar, a status bar, preview, split window, multi-document find and replace with regular expressions, possibility to show invisible characters, authenticated open and saves, command-line utility, full screen editing and running commands and scripts from within the application.

Created, designed and programmed by Peter Borg.

Smultron is free but to stimulate further development you might consider making a donation if you find it useful.