A web-based tool for creating animated videos. PowToon markets itself as more of a business tool and its styles are less cartoon-like than other tools. With the free account, users are able to save videos up to 3 minutes long and can upload a voice-over track and/or audio track.
The free version does not allow you to download your video as a file. All free videos bear the PowToon logo. However, you can screencast a Powtoon video as an option for getting a version you can save.
You can create longer videos by shooting in 3 minute segmants, screencasting them, and then use a video editor to put them together.