Gawker (Free).

Let your computer do the gawking.

Gawker is an application for Mac OS X that creates time-lapse movies using a webcam. Images from your camera can be shared, allowing other users to record your image stream. Streams can also be combined to create a time-lapse movie with up to four locations side-by-side.

So, what does this really do? Examples here.

Download it here.

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