Foundation 3 is the most advanced responsive front-end framework in the world. With Foundation you can quickly prototype and build sites or apps that work on any kind of device, with tons of included layout constructs (like a full responsive grid), elements and best practices.
Foundation 3 is built with Sass, a powerful CSS preprocessor, the grid lets you lay out pages quickly and logically with a flexible, nestable system. Even better, the Grid can be whatever size you need — it’s easily adapted to any size screens, from phones to TVs.
It includes dozens of styles and elements to help you quickly put together clickable prototypes, that can then be adapted and styled into polished production code. Forms, buttons, tabs, all kinds of good stuff.