The AODN open geospatial portal is a Grails application for discovering, subsetting, and downloading geospatial data.
The application is a stateless front end to other servers:
GeoNetwork metadata catalog
GeoServer data server (WMS and WFS and our WPS subsetting and aggregation services
THREDDS Gridded (ncWMS files) data server with embedded ncWMS (http://www.resc.rdg.ac.uk/trac/ncWMS/) web map server
You can view the portal in action at AODN Portal, which always runs the latest version of the code.