If you have $40 and a recent Mac with an iSight camera, then you have the makings of a simple home surveillance system thanks to Witness. Developed by Orbicule, Witness is a surveillance app that turns your Mac's camera into a motion sensor. The application runs in the background on your computer and will begin recording video or photos if motion is detected.
The system includes a free remote iOS app compatible with the iPhone, iPad and iPod touch. When an intruder is detected, Witness will send a notification to your iOS device and your web browser if it is open. Photos and video captured by the Witness app are available online and can viewed using a web browser or via the Witness Remote application.
