Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
Topstyle - TopStyle contains powerful tools for building standards-compliant web sites.
Atom - At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it.
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.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
EnjoyCSS - CSS generator for rich graphical styles without coding