Ubuntu Mockup Tool. Point and curve smoothly. It s a cross platform application available in stand alone form or as a firefox add on.
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This is a webui mockup tool that allows you to open or inspect any psd sketch or other design formats. The balsamiq mockup or balsamiq studios is probably the best known web ui mockup tools for free on the list. Build things fast consistently and save yourself the repetitive work.
If you would like to try every newest feature added by developers you can try the nightly builds created automatically in the build server.
The balsamiq mockup or balsamiq studios is probably the best known web ui mockup tools for free on the list. You could probably use it for software application interface development as well. It is a desktop based application can be used to prototype for any mobile and web apps. Pencil has lot of great features ui elements icons etc that allow you to easily create sketches for desktop and web apps.