Bootstrap

A rock-solid default for HTML5 awesome. HTML5 Boilerplate is the professional badass's base HTML/CSS/JS template for a fast, robust and future-proof site. After more than three years in iterative...

The ‘tiny screen first’ responsive boilerplate.

Responsable is a responsive HTML CSS LESS SCSS framework with clean markup, normalized CSS, and responsive images. It allows for nested columns for easy grid nesting and customization, and provides …

CSSHórus is a CSS framework for easy and fast development of responsive and mobile websites. It contains 16 grid columns and basic style formats (Resets, Basics, Typography, Lists, Links, Table, …

inuit.css is a lightweight, constantly updated CSS framework which provides you with a pragmatic and feature-rich starting point for all your projects. It is crammed full of useful snippets, best …

The Fluid Baseline Grid System is an HTML5 & CSS3 development kit that provides a solid foundation to quickly design websites with ease.

Set column and gutter widths, choose the number of columns, and switch between pixels and percentages. All without any .grid_x classes in your markup. Oh, and did we mention it's …

Gridless is an optionated HTML5 and CSS3 boilerplate for making mobile first responsive, cross-browser websites with beautiful typography.

Dig responsive design? Hate fluid grids? Try a Frameless grid.

Responsive. Infinite nesting. One class per element. Simple.

The Goldilocks Approach to Responsive Web Design - A good starting point for design that takes device resolution out of the equation.