Foundation 3 is The most advanced responsive front-end framework in the world. With Foundation3 you can quickly prototyping + creating the production code 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.
It gives you new tools to quickly customize and build on top of Foundation. The developers have added new elements, new options, and tons of streamlining to make this the fastest way to prototype responsively.
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
Foundation 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.
The Grid lets you quickly put together page layouts for mobile devices and the desktop. You don't need two different sites — the Grid is built to create a rock-solid experience on all kinds of devices with the exact same markup.