Subform is CAD-inspired design tool for Mac and Windows, focused on the unique constraints of user interface design. And it’s now available on Kickstarter.

In a nutshell, Subform empowers designers to create responsive layouts, enforce consistent styles, build stateful components, and work with real content—all inside of a familiar, desktop-based visual design environment.

Formerly known as “BoxBox”, this tool looks like a real step forward in moving from static designs to a more fluid design process. The best thing is that there’s a working beta and if the two developers meet our Kickstarter goal, every backer will be able to download and use the tool immediately, while non-backers will have to wait until sometime next year for the public release.