Materialize CSS - A modern responsive front-end framework based on Material Design
Svelte - Cybernetically enhanced web apps
Foundation - The most advanced responsive front-end framework in the world
Glimmer - Fast and light-weight UI components for the web
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.