Radix Icons - A crisp set of 15×15 icons. Open source.
Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer
EnjoyCSS - CSS generator for rich graphical styles without coding
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
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.