The Pencil Project An open source prototyping extension for Firefox 3 that allows a user to create GUI prototypes using built in stencils which can be saved and exported as .pngs.
It looks like it could be pretty handy for the odd job but I found it slightly quirky and slow compared to using an offline application, also there’s a current lack of stencils (shape collections) which I guess will change. Where it might come in handy is rapid prototyping with clients at brainstorming sessions. One to watch as more developers come on board and I’m sure we’ll be seeing a lot more of these online tools.
