Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
Animista - Create beautiful CSS animations in your browser
Topstyle - TopStyle contains powerful tools for building standards-compliant web sites.
Glass UI Generator - CSS generator for glassmorphism
EnjoyCSS - CSS generator for rich graphical styles without coding
Glassmorphism - A modern CSS UI library based on glassmorphism