HotGloo is an Online Wireframe Application. With the help of the elements you can create a whole world out of wireframes. Just drag and drop, scale, link, name and rename them – it’s super easy and intuitive.

You can manage your projects: edit, comment & share any moment of the developing process with colleagues and clients. You can also add editors & reviewers to your projects within just a view steps and as you like. HotGloo is free for the beta testing phase. However they are thinking about a reasonable monthly pricing model for after the beta testing stage.

Requirements: -
Demo: http://hello.hotgloo.com/
License: License Free