Webcams
From MacFAQ
Most modern Macs (iMacs and MacBooks) have built-in iSight cameras.
Otherwise there are a number of alternatives:
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Apple iSight camera (FireWire)
The original cylindrical iSight is no longer available from Apple, but can be found readily on the second-hand market. It's considerably better than the built-in models, if not quite so convenient.
any FireWire webcam
Any other FireWire webcam can simply be plugged in and will work under Mac OS X - there is no need for camera drivers.
almost any FireWire-equipped video camera
Almost - though not all - video cameras equipped with FireWire are similarly supported.
USB webcam
A USB webcam will require additional drivers. A number of webcams have driver support for Mac OS X courtesy of the manufacturer. Of those that don't, many are supported instead by the open source Mac OS X webcam driver project, Macam

