Smultron is a text editor written in Cocoa for Mac OS X 10. 4 Tiger or later. It is designed to be easy and intuitive to start off with and to become more and more able as and when the user wants it.

Some of its features are line numbers, support for syntax colouring for many different languages, functions list, support for text encodings, snippets, a toolbar, a status bar, HTML preview, split window, multi-document find and replace with regular expressions, possibility to show invisible characters, tabs, authenticated open and saves, command-line utility, .