Here is a great article I found on WDL that puts together a list of some tools to help create responsive web sites.
Creating a responsive web design goes way beyond arranging things in a way that won’t compromise the look of your website in different screen sizes. Even tough we talk a lot about responsive web design, we are all figuring out the best way to go about developing a responsive site. One of the best ways to approach the issue is checking out tools that may help you with the task. However, there are a lot of tools out there, and it can be difficult to sort through them all. So for this post, we gathered some of the ones we find the most useful.