Complete Ruby geocoding solution.
The Ruby gem for querying Maxmind.com's GeoIP database, which returns the geographic location of a server given its IP address
Official Geokit Gem. Geokit gem provides geocoding and distance/heading calculations. Pair with the geokit-rails plugin for full-fledged location-based app functionality.
Official Geokit plugin for Rails/ActiveRecord. Provides location-based goodness for your Rails app. Requires the Geokit gem.
Enables easy Google map + overlays creation in Ruby apps
Geospatial data library for Ruby