Adobe Photoshop

Photoshop is THE only tool I use to create morphs/animorphs/animangles.
The main tool/brush I use within Photoshop is the "healing brush".
The healing brush is similar to the clone tool often found on image / photo
editing software that copies a section of the image from one area to another.

The key difference between the clone tool and the healing brush
is that the healing brush intelligently looks at the image and blends it together.