Aptus is a dedicated browser that lets you preview, edit and screenshot your responsive site at any size from mobile through to large desktop.

A Conceptual Framework for Extending Upon the Functionality of 960.gs

A little utility I just put together does that for you: Post Grabber detects POST data and generates an equivalent “curl” command that can be used in shell or Automator scripts.

Placeholder Images for every case. Webdesign or Print. It's simple and absolutely free!

a collection of responsive web designs