Prey will track up to three devices with a limited number of reports for free. If you pay (http://preyproject.com/plans), you can hold more reports or track more devices.
"Prey lets you keep track of your phone or laptop at all times, and will help you find it if it ever gets lost or stolen. It's lightweight, open source software, and free for anyone to use. And it just works." - preyproject.com
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What's it for then?
Prey will track up to three devices with a limited number of reports for free. If you pay (http://preyproject.com/plans), you can hold more reports or track more devices.
"Prey lets you keep track of your phone or laptop at all times, and will help you find it if it ever gets lost or stolen. It's lightweight, open source software, and free for anyone to use. And it just works." - preyproject.com