Link: Pencil Project – a Firefox plugin that professes to enable you to build wireframes and prototyp

Pencil Project – a Firefox plugin that professes to enable you to build wireframes and prototyp
Pencil (free) is a Firefox plugin that professes to enable you to build wireframes and prototypes. As a prototyping tool it’s quite good, allowing you to quickly put together a reasonably high fidelity mockup. However, be aware you’ll still need to produce the visual design elements for Pencil, as it relies on dragging and dropping pre-made graphical elements.