When Groundspeak stopped supporting Google Maps, I hacked this script to parse GPX files and display then using the Google Maps API. It started as a personal project, but perhaps someone wants to use (or even contribute) to it...
git clone git@github.com:rene-dev/pqongmaps.git
rake db:migrate
bundle install
Make sure the ruby has permissions to write into uploads
rackup
upload a gpx file on http://localhost:4567/upload
Specify your HOME in wrapper.fcgi. If you use RVM, edit the "Path to .rvmrc"-line in wrapper.fcgi to your actual path to the .rvmrc. (Usually the path in which you cloned this repo). If you do not use RVM, just comment this line. Point your browser to this path and enjoy.