A free program for Android, by Tracki.

Tracki is the most versatile and easy-to-use GPS tracking app for kids and pets. Use it to track, monitor, and protect your loved ones. 

By using this app you can keep tabs on your cars or even kids whenever or wherever you are within 10-60 feet. It will also send you alerts and notifications through SMS. Moreover, this app is flexible on any device, allowing you to locate through mobile phones and computers. You can also view your history, 

How to use Tracki

To start using Tracki, install the app and follow the setup instructions. With a username (your email address) and password, you can access the Tracki app, as well as register for a new account.