Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
CSSEdit - Design beautiful, innovative and fast-loading web sites… with a beautiful, innovative and fast app.
Notepad3 - Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting.
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.
TED Notepad - TED Notepad is a portable text editor software that deals with a large variety of text processing tools, supplemental text clipboards, high accessibility through hotkeys, and a customizable number of settings and options.