Milligram
A minimalist CSS framework
22 Alternatives To Milligram
BareCSS
A classless CSS framework
Basis
A lightweight responsive Stylus/CSS framework based on flexible box.
Blaze CSS
Open source modular CSS framework providing great structure for building websites quickly
Bootstrap
Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Bulma
Bulma is an open source CSS framework based on Flexbox and built with Sass. It’s 100% responsive, fully modular, and available for free.
Foundation
The most advanced responsive front-end framework in the world
Gridlex
Simple. Robust. Responsive. Flexible.
Lit
World’s smallest responsive CSS framework (398 bytes!)
Material-UI
A CSS Framework and a Set of React Components that Implement Google’s Material Design
Mustard UI
A CSS framework that actually looks good.
Phonebot
Make phone calls from within a Slack channel
Purecss
A set of small, responsive CSS modules that you can use in every web project.
Purgecss
Easily remove unused CSS
React95
Refreshed windows95 UI components for modern web apps
Renaissance
The Freshest CSS Framework
Semantic UI
A UI Component library implemented using a set of specifications designed around natural language
Spectre
Spectre is a web application to diff screenshots.
Unnamed
A colorful CSS framework made by a human not an AI
WING
A phone carrier that is actually nice to you.
Yeti
Yeti provides software development and design services.