Stopmotion is a free application for creating stop motion animations.

You can create stop-motion animations with images grabbed
from your favourite video device. You just sets stopmotion to
use a grabber program which works with your device. It is also
possible to do the same with video export; just plug in an
encoder capable of doing video export from couple of images.

Stopmotion has a set of tools which helps you creating the
movements smooth and precise.