Apps similar to Eternium include Bootstrap, which is free and open source. Other options are Tailwind CSS, Bulma, Foundation and Purecss. In total there are seven CSS Frameworks like Eternium for self-hosting, the web, Mac, Windows and Linux.
Bootstrap is a open-source collection of tools for creating browser sites and applications. It contains HTML and CSS-based design templates for typography, forms, buttons, charts, navigation and other interface components, as well as optional JavaScript extensions.
Tailwind is different from frameworks like Bootstrap, Foundation, or Bulma in that it's not a UI kit.
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Foundation, a responsive front-end framework by Zurb, includes customizable HTML, CSS, and JS resources, enabling the creation of semantic, device-friendly websites and emails, promoting accessibility and content focus, with tools for designers and developers.
A set of small, responsive CSS modules that you can use in every web project.
Topcoat is a brand new open source CSS library designed to help developers build web apps with an emphasis on speed. It evolved from the Adobe design language developed for Brackets, Edge Reflow, and feedback from the PhoneGap app developer community.
Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.
