We served data to tiled clients like Google Maps, Google Earth, and other tiled base mapping tool kits using a custom tile server application. It is written in "Ruby":http://www.ruby-lang.org/ and uses "Mongrel":http://mongrel.rubyforge.org/ in combination with "Rack":http://rack.rubyforge.org/ as the web server engine. Image processing is performed with the "Ruby language bindings":http://rmagick.rubyforge.org/ to "ImageMagick":http://www.imagemagick.org/script/index.php.