Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Rapid CSS Editor - Rapid CSS editor is quick, powerful and easy to use HTML and CSS code editor for web developers. Intuitive interface and intelligent features help you become more productive and create modern HTML5 and CSS3 based websites faster and easier.
HTML-Notepad - HTML WYSIWYG editor for structured documents
Topstyle - TopStyle contains powerful tools for building standards-compliant web sites.
iNotepad - Write and organize all your texts and notes on Mac.