Smultron is an open-source text editor written in Cocoa for Mac OS X with many of the features that you might need. Smultron features easy selection of the opened documents, line numbers, support for syntax colouring for many different languages, support for text encodings, code snippets, HTML preview, multi-document find and replace with regular expressions, a toolbar, a status bar, possibility to show invisible characters,authenticated saves, command-line utility, .Mac synchronisation of preferences and many more features.Here are some key features of \"Smultron\":