Leaf PHP - Simple and elegant PHP | Leaf PHP

Slim Framework

Framework X

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Codebase

Global and local styling

Simple.css - A classless CSS framework

cipher-code/phpframework: Example DIY PHP Framework

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Superkube

ChartsCSS/charts.css

daveberning/griddle: A CSS Grid Framework

new.css

mono/color

Halfmoon - Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools

Cirrus - Typography

MVP.css - Minimalist stylesheet for HTML elements

turretcss - A Responsive Front-end Framework for Accessible and Semantic Websites

Spectre.css CSS Framework

UIkit

TACHYONS - Css Toolkit

Knopf.css - Open source button system leveraging CSS variables

holiday.css - a minimalist classless CSS theme

Milligram - A minimalist CSS framework.

swlkr/ridgecss

Basscss

The Cost of Javascript Frameworks - Web Performance Consulting

Documentation - Materialize

kognise/water.css

Bulma: Free, open source, & modern CSS framework based on Flexbox