Open Source Geoportal

The Geospatial Portal Beta is built completely on Open Source Software. From the site:

It utilizes the OpenLayers mapping library.
It uses Tilecache to serve the maps (WMS), which in turn uses GeoServer as the back end (which in turn uses PostgreSQL/PostGIS).
It uses the jQuery library for Javascript effects and AJAX.
All tabular data is pulled from REST web services (JSON) dynamically via AJAX, including spatial analysis via PostGIS. No page refreshes.
Because it’s all AJAX, there’s no server side code in the application itself. There’s nothing but Javascript and HTML.

(Through slashgeo.)

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