Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
HTML-Notepad - HTML WYSIWYG editor for structured documents
Topstyle - TopStyle contains powerful tools for building standards-compliant web sites.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
ChrunchApp - The LESS editor and compiler that almost makes it too easy.
iNotepad - Write and organize all your texts and notes on Mac.