Apps similar to Phonon Framework include Bootstrap, which is free and open source. Other options are Tailwind CSS, React Native, Bulma and Ionic Framework. There's no shortage of CSS Frameworks like Phonon Framework, with more than 100 alternatives for the web, self-hosting, Mac, Windows and Linux.
The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem.
Milligram provides a minimal setup of styles for a fast and clean starting point. Specially designed for better performance and higher productivity with fewer properties to reset resulting in cleaner code.
Set column and gutter widths, choose the number of columns, and switch between pixels and percentages.
Webments is a collection of libre frameworks designed with scratch CSS using different design languages.
inuit.css is a lightweight, constantly updated CSS framework which provides you with a pragmatic and feature-rich starting point for all your projects.
The Fluid Baseline Grid System is an HTML5 & CSS3 development kit that provides a solid foundation to quickly design websites with ease.
Unsemantic is a fluid grid system that is the successor to the 960 Grid System. It works in a similar way, but instead of being a set number of columns, it's entirely based on percentages.
960 grid system with 12 columns for Responsive Web Design. PSD file which has the 960 grid setup for you based on 32px gutters/margins.
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