The mkgmap program converts map data from OpenStreetMap into the Garmin img map format that can be loaded onto Garmin GPS devices. It also combines maps and produces the auxiliary files required to load into map viewing programs.
Locate Me! is a script to geolocate your customers. It supports W3C (iPhone OS 3.0 and Mozilla Geode), Gears (Google), Loki (Skyhook Wireless), and IP-based services like IPLocationTools and MaxMind.