Currently on promotion until Sep 3, 2013 at 50% off regular price.
CamPreview lets you preview all attached video input devices such as the FaceTime camera. You can also rotate the view or reflect it horizontally.
Great for monitoring multiple camera feeds. Borderless resizable preview window makes it great for working with web conferencing software in desktop sharing mode or doing screen recording using QuickTime Player.
The maximum number of webcams it can handle is limited by the hardware capability of the computer and the operating system.