Using the freeware WinMorph (quite old, but fast, simple UI and works reasonably well) and open-source GIMP.
Morphing a Spider into a Quickdraw:
(v large gif v)
First attempt:
Spoiler
WinMorph UI:
Note you better set the Warp Precision to High or Accurate when exporting (Options, F3), and reset to Medium or lower for a preview in the program. AVI output seems broken, but PNG output works fine.
For GIMP, you'll probably need a plug-in to reverse the animation.
Edited by Phaesphoros, 13 June 2013 - 02:52 AM.