Wireframe Sketcher has become my favorite tool of late. Clickable PDFs, simple text markup for control data, story boarding and eclipse integration. No real ti

Wireframe Sketcher has become my favorite tool of late. Clickable PDFs, simple text markup for control data, story boarding and eclipse integration. No real time collaboration but that hasn't been an issue for me. The free version nags you a bit but the price was so low I just paid for it.