CSS-in-JS with build time generated styles, RSC compatible, multi-variant support, and best-in-class developer experience.

GroundworkCSS is described as '100% free and open source responsive HTML5, CSS and JavaScript Framework' and is a CSS Framework in the development category. There are more than 50 alternatives to GroundworkCSS for a variety of platforms, including Web-based, Self-Hosted, Mac, Windows and Linux apps. The best GroundworkCSS alternative is Bootstrap, which is both free and Open Source. Other great apps like GroundworkCSS are Tailwind CSS, Semantic UI, Foundation and UIkit.
CSS-in-JS with build time generated styles, RSC compatible, multi-variant support, and best-in-class developer experience.

Create beautiful, responsive & accessible web apps quickly with Vue or Nuxt. Nuxt UI is an open-source UI library of 100+ customizable components built with Tailwind CSS and Reka UI.




jQuery UI is an open source library of interface components — interactions, full-featured widgets, and animation effects — based on the stellar jQuery javascript library . Each component is built according to jQuery's event-driven architecture (find something, manipulate...


A set of beautifully-designed, accessible components and a code distribution platform. Works with your favorite frameworks. Open source. Open code.

Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools.
Stylify is a library that generates utility-first CSS dynamically based on what you write. Write HTML. Get CSS 🚀.




EFY allows you to customize the design of your html based apps or websites from an UI sidebar menu and combine billions of possible patterns. You can also create, share or import json themes for easier access. All apps that use efy can share the same theme or individual themes.




Eva Design System is a free and open-source, customizable design system. Available for Sketch with Mobile and Web component libraries.

Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
Metro UI CSS a set of styles to create a site with an interface similar to Windows 8.