Brix

Probably the best Interface Builder for Bootstrap!

Reviews
Discussion
Hunter
We used Jetpack in the past for building quick landing pages with Bootstrap without bugging our devs. Brix looks even better than that!
I've been pleased with Divshot (cc @mbleigh). This looks very similar.
Their pricing model is a very steep compared to other competitors in this space, particularly the $1000/mo plan that has been dimmed in the background.. Other alternatives include Easel, Webflow, Divshot, and Froont to name a few.
I love the tagline. Probably one of the best I have read.
Yeah, I thought of divshot when I read the description. Although they seem to be more focused on their static hosting (a good move IMO). This looks kind of crazy expensive in comparison....