Question: Who all have developed a cross platform software?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/operatingSystem> <http://dbpedia.org/resource/Cross-platform> . ?x <http://dbpedia.org/ontology/developer> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Software>}