Cost / License
- Free
- Open Source (MIT)
Platforms
- Self-Hosted


FlyonUI is described as 'Is designed to combine the best of both worlds: the aesthetic appeal of semantic classes and the powerful functionality of JS plugins' and is a CSS Framework in the development category. There are more than 50 alternatives to FlyonUI for a variety of platforms, including Web-based, Self-Hosted, Mac, Windows and Linux apps. The best FlyonUI alternative is Bootstrap, which is both free and Open Source. Other great apps like FlyonUI are Bulma, Semantic UI, Foundation and UIkit.


Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
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.



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.

MUI is a lightweight HTML/CSS/JS framework that follows Google's Material Design guidelines.



Flat UI Pro is made on the basis of Twitter Bootstrap in a stunning flat-style, and the kit also includes a PSD version for designers. Flat UI Pro contains a huge number of basic components, icons and glyphs.
GroundworkCSS is a 100% free and open source responsive HTML5, CSS and JavaScript Framework.
HTML KickStart is a ultra–lean set of HTML5, CSS, and jQuery (javascript) files, layouts, and elements designed to give you a headstart and save you a lot of hours on your next web project.
Kendo UI is JQuery-based framework for rich UI, build HTML5 apps that look native on any device, build desktop and mobile applications for any browser.
