tracking packages from many international companies

Silent but deadly

Basically you install a tiny agent in your PC or phone, which silently waits for a remote signal to wake up and work its magic.

This signal is sent either from the Internet or through an SMS message, and allows you to gather information regarding the device's location, hardware and network status, and optionally trigger specific actions on it

Open Source GPS Tracking System. It allows to use mobile phones with J2ME support as mobile trackers and see its tracks on Google Maps online. There is a web RESTful API for GPS data input. See details on http://www.wannatrak.org