Skeleton is a small collection of CSS & JS files that can help you rapidly develop sites that look beautiful at any size, be it a 17" laptop screen or an iPhone. Skeleton is built on three core principles:
PrettyCSS Alternatives
PrettyCSS is described as 'Build your website interface using a responsive CSS framework with various components and with integrated dynamic functionalities' and is a CSS Framework in the development category. There are more than 50 alternatives to PrettyCSS for a variety of platforms, including Web-based, Self-Hosted, Mac, Windows and Linux apps. The best PrettyCSS alternative is Bootstrap, which is both free and Open Source. Other great apps like PrettyCSS are Tailwind CSS, Bulma, Semantic UI and Foundation.
Alternatives list
CSS-in-JS with build time generated styles, RSC compatible, multi-variant support, and best-in-class developer experience.

A unified, HTML5-based user interface system for all popular mobile device platforms, built on the rock-solid jQuery and jQuery UI foundation. Its lightweight code is built with progressive enhancement, and has a flexible, easily themeable design.
Cost / License
- Free
- Open Source
Alerts
- Discontinued
Platforms
- Online
- jQuery


Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools.
Eva Design System is a free and open-source, customizable design system. Available for Sketch with Mobile and Web component libraries.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Self-Hosted
- Sketch

Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
Cost / License
- Free
- Open Source
Platforms
- Online
- LESS
- jQuery
Simple. Robust. Responsive. Flexible.
Based on Flexbox (CSS Flexible Box Layout Module), Gridlex is a very simple css grid system to quickly create modern layouts and submodules.

Little Widgets is a collection of beautifully designed HTML website widgets and popups. It’s coded, responsive, animated and ready to use on your website.



Mobile Angular UI is a mobile UI framework just like Sencha Touch or jQuery Mobile. If you know Angular JS and Twitter Bootstrap you already know it!
Cost / License
- Free
- Open Source
Platforms
- Self-Hosted
- 55 MUI alternatives
MUI is a lightweight HTML/CSS/JS framework that follows Google's Material Design guidelines.










































