iAlertU!

Prey is a lightweight application that will help you track and find your laptop or mobile if it ever gets stolen. It works in Windows, Mac OsX, Linux and Android.

If you lose your iPhone or iPad, you can find it with the Find my iPhone service, a free part of MobileMe.

Remotely control your Android phone from the internet or by SMS.

Ever lost your phone and you go to call it to listen for the ringer and remember its on silent mode? Now when you lost it you can text your phone and it will turn silent mode off, the ringer vol up, and start ringing.

Ever misplaced or lost your phone? Android Device Manager locates lost devices and helps you keep your device—and the data inside it—safe and secure. Android Device Manager lets you:? Locate Android devices associated with your Google account? Reset your device's screen lock PIN? Erase all data on the phone

A GUI can be found here : https://github.com/BoboTiG/pombo/tree/master/gui

iLostFinder is featured as the best anti-theft app for iPhone. It will prevent others from powering off your iPhone in case it gets lost and prevent them from disabling Internet on the lost device. Besides, iLostFinder will help you to find your lost iPhone by taking photo of the thief and sending it to your Email.

Protect Your Mobile Phone. Real-time tracking, remote locking, and more!

Because laptops are increasingly popular, and desktops are becoming smaller and more portable, computer theft has reached huge proportions worldwide. According to a recent FBI report, 97% of all stolen computers are never recovered. Many people we know have had their Macs stolen, often in safe situations. Thats why we developed Undercover: a unique theft-recovery application designed from the ground up for Mac OS X.

Locate, track & monitor computers & phones online.

Plan B Track Lost phone is one of the most popular app in the playstore. This app used by many users to find the smartphone, even they didn’t install this app before losing it. You can just make a try.

Computrace LoJack for Laptops can remotely delete data and recover stolen computers, so you can protect your personal information from identity theft. The easy solution for protecting your digital life.

LAlarm is free laptop alarm security software. LAlarm sounds an alarm when a laptop is in danger of being stolen or losing data, and it can recover and destroy data if the laptop is stolen. LAlarm consists of five alarms and other security functions designed to protect laptops and sensitive data against theft as well as prolong the battery lifetime.