Macaw has some real promise for those looking for a responsive design tool. It’s probably even going to give Edge Reflow CC a run for its money, but where these tools wind up is anyone’s guess. It’s a shame Macaw was released a little early with too many bugs not yet ironed out. The guys who started Macaw have a long road ahead, especially with the influx of bug reports and feature requests, but this is the type of tool that promises to make our web design lives easier.
Currently, Macaw has no documentation to speak of, but you can check out a handful of videos.