OpenGTS (Open Source GPS Tracking System) is a full featured web-based GPS tracking system for your fleet of vehicles. It supports OpenLayers and other map providers, detail/summary Reporting, and various GPS tracking devices.
This app be used by victims in disaster to upload their position with a GPS enabled device so that rescue workers may find them accurately on a map. This works on Android, iPhone, Nokia, Windows Mobile, Palm OS & Blackberry. I made this for RHoK #3.