ManyCam Virtual Webcam
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Full user review
"Good introduction to a fun video conferencing concept."
A good "basic" program if you can't find other options. (Better than CamTwist - couldn't get that one to work at all!)
Doesn't quit properly. Slows down the camera. Navigating ManyCam within a chat is fiddly. Would like to be better quality - perhaps even be able to sync speech with animations.