Thanks very much. 1) ExtJS for the application bits, but that's only about 500 lines of code at the top. The drawing canvas is 25k lines raw JS using no framew

Thanks very much. 1) ExtJS for the application bits, but that's only about 500 lines of code at the top. The drawing canvas is 25k lines raw JS using no framework. 2) It's Jetty, but the thing is, we barely need a backend. The whole idea of this was to do it all in the client so we have virtually zero server costs, see this <a href="http://mxgraph.blogspot.com/2011/01/mxgraphcom-business-model.html>post</a> http://mxgraph.blogspot.com/2011/01/mxgraphcom-business-mode.... 3) We don't need to. We make a lot of money selling the drawing component, this is a project more for fun to create an online visio pretty much entirely on the client. We have the component and just thought how easy such an app would be to write and give away for free (storage is local, so doesn't cost us either). What you see took 2 weeks (OK, the component took 5 years...). 4) a) No b) No. Life's too short :).