A little test with gimp GAP... Seems pretty cool once it is correctly configured (specially keyboard shortcuts for frames navigation)....

A little test with gimp GAP... Seems pretty cool once it is correctly configured (specially keyboard shortcuts for frames navigation). The only big problem is that there is no undo. The bad cropping of the anim below is a direct consequence of this...

Based on this tutorial: http://www.gimp.org/tutorials/Advanced_Animations/