Materialize CSS - A modern responsive front-end framework based on Material Design
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Topcoat - TopCoat, TopWeb, Rheologic, Software for coating, drying, converting, web handling, industries.
Less - Less extends CSS with dynamic behavior such as variables, mixins, operations and functions. Less runs on both the server-side (with Node. js and Rhino) or client-side (modern browsers only).
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Sass - Syntatically Awesome Style Sheets