Dvolver is a very basic animation/movie maker which is more suited to KS2 use. It doesn’t have many options, but it can produce nice looking animations quickly and they are very easy to embed into blogs or send via email.
Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.