ImageSalsa!

ManyCam allows you to use your webcam, TV tuner, or any other video source with multiple applications at the same time. It also enables you to add graphics and other effects to your video output.

CamTwist is a software package that lets you add special effects to your video chats. Its also possible to stream your desktop and still images. With CamTwist, you can also use multiple video chat programs at the same time.