I made a simple rotoscoping tool just for me few month ago. It only was a palette, a pen and an eraser on a transparent canvas (so you can draw what you see behind your window. I use it for the last ludum dare and found that it was not bad...
But my tool was simple and lot options were missing (to save a drawing I made screenshots!). So I improve it.
I start one or two weeks before the toolbox jam, but it made me very motivated! Thanks guys!