PortalCore is a web-pased portal toolkit that provides faceted browsing on RDF data. It was built at HP Labs and used in various customer projects.
Unlike Longwell, which also provides faceted browsing of RDF datasets, PortalCore is highly configurable. Which facets to use for navigation, how the facets work, what templates to use to display instances and so on.
The UI can show both authoritative and non-authoritative data and users can still distinguish between the two.
Velocity is used as template engine. Lucene provides full text search.
PortalCore predates SPARQL. Dave says it should migrate to SPARQL, especially because of LIMIT. Would be nice if it used Jena assemblers as well to specify the data to be used.
Big limitation: It’s just a browser, there’s no way to annotate resources.
(Personally I think that a good faceted browser needs heavy customization.)