Robin Good: This free service kindly provided by the Australian centre for the Moving Image, allows film and video students as well as buddying film freaks to easily create a reference storyboard without knowing how to draw a line.
The tool is completely web-based, and it provides a choice of three possible types of scripts to work on:
Once you have chosen a script, the online scripting editor makes it easy for you to work on your script as you would expect.
Then, using a library of camera shots and moves that can be easily dragged and dropped on your empty storyboard canvas, you can give visual life to your script. You can add your own pictures and illustrations to the library as to customize the storyboard in any way you want.
More info: http://generator.acmi.net.au/storyboard