Gde Swart The freshest and smartest Responsive webpage editor I've found so far. Only a 25MB download and it delivers real results. Minimal learning curve, because it works like you think it should. You can use it alone or alongside another editor like Dreamweaver (nice trick). Supports all of the responsive frameworks. directly edit HTML/CSS/LESS or drag and drop without making a mess of your code. It's just really slick.
You really should check it out. At $50 it's a deal, worth every penny.
One of the best software purchases I've made this year.
With a BDJ discount, these guys could get some of the recognition they deserve.