Responsive Web CSS – Web-Based Responsive Layout Creator
If you are already using a CSS or front-end framework, creating responsive layouts shouldn’t be hard.
However, if you are new to such layouts, Responsive Web CSS can help you get started quickly.
It is a web-based tool that enables anyone to create a responsive layout skeleton with drag ‘n’ drops.
You can simply add any number of pages, divs and define the widths in percentages.
There is support for nested grids and it is possible to select the targeted devices. After all, the HTML-CSS is created automatically and will be ready-for-download.