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Best Open Source css framework Libraries

A curated list of the most popular GitHub repositories tagged with css framework. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1twbs/bootstrap

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

174,002MDX
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#2tailwindlabs/tailwindcss

A utility-first CSS framework for rapid UI development.

93,706TypeScript
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#3Semantic-Org/Semantic-UI

Semantic is a UI component framework based around useful principles from natural language.

51,149JavaScript
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#4jgthms/bulma

Modern CSS framework based on Flexbox

50,062CSS
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#5saadeghi/daisyui

🌼 🌼 🌼 🌼 🌼  The most popular, free and open-source Tailwind CSS component library

40,313Svelte
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#6Dogfalo/materialize

Materialize, a CSS Framework based on Material Design

39,163JavaScript
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#7nostalgic-css/NES.css

NES-style CSS Framework | ファミコン風CSSフレームワーク

21,640SCSS
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#8thomaspark/bootswatch

Themes for Bootstrap

14,758JavaScript
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#9troxler/awesome-css-frameworks

List of awesome CSS frameworks in 2026

9,223CSS
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#10ChartsCSS/charts.css

Open source CSS framework for data visualization.

6,553HTML
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