OpenGuardian

Openguardian is an open source solution for deterring theft.

it works by enabling you to
*remotely lock your device
*securely wipe your device
*trace it
*message the owner if you find the device with a single press.

unlike other solutions out their OpenGuardian is end to end open source, the "Agent" installed on your devices is open source, the server an apache web server with Wordpress and the OpenGuardian portal Wordpress plugin.

so you can git checkout and have your own anti theft service up and running in an hour; if you wanted to.