I'm not associated with them at all, I stumbled on them the other day when looking for a halfway decent wireframe tool for OS X. It is very reminiscent of Axur

I'm not associated with them at all, I stumbled on them the other day when looking for a halfway decent wireframe tool for OS X. It is very reminiscent of Axure, what I consider to be one of the best professional wireframing tools out there for anything more complicated than a simple dialog. HotGloo actually exceeds it in a lot of ways: the interface is significantly less cluttered and complicated than Axure's. Building state management and state driven interactions is a snap, plus you can trigger events on mouse overs, mouse outs and when the element is initialized. The review mode allows collaborators to click through and leave notes, Axure has a fairly clumsy HTML export that works very poorly. It has a number of drawbacks too. You can't share custom elements across projects. There is no versioning, or creating copies of projects, so experimenting/refactoring is permanent. I wish review mode had comments, as well as the existing annotations. I wish I could make notes on elements and then generate a functional spec PDF. It would be nice if it generated PDF's in general, right now it only exports PNGs. It's a brilliant start though and is already heads above Balsamiq. Definitely better than ProtoShare too. It's certainly going to give Axure a run for it's money.