doap:store now provides a SPARQL endpoint for its data. The RDF store used is threestore, so it supports GRAPH queries, but you may have to use the http://triplestore.aktors.org/direct/# namespace for some properties (as direct:type instead of rdf:type in GRAPH queries). In order to write queries, the endpoint uses Danny Ayers' sparql-editor.
I also updated / fixed the service regarding various points:
^xxx$) when searching by language.Thanks to those who sent feedback !