Open Source Anti-theft Solution For MAC, PCs and Phones

Prey is an open source application that helps us track the lost laptops or phones. 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.

In order to understand more about the project, visit the Official website.

Also try this video tutorial for configuring the Prey application.

I hope it becomes useful for you. :)