These are the results of the following SPARQL query run on the RING endpoint: http://ring.ciard.net/service/sparql

PREFIX rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/> 
PREFIX doap: <http://usefulinc.com/ns/doap#>

SELECT DISTINCT ?URI
WHERE {
   ?URI rdf:type doap:Project .
   ?URI doap:name ?Name .
   OPTIONAL { ?URI doap:category ?Type }
}