Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Free_software_operating_systems> . }
- Category:Haiku_(operating_system) broader Category:Free_software_operating_systems.
- Category:Inferno_(operating_system) broader Category:Free_software_operating_systems.
- Category:Linux broader Category:Free_software_operating_systems.
- Category:NetBSD broader Category:Free_software_operating_systems.
- Category:OpenBSD broader Category:Free_software_operating_systems.
- Category:OpenSolaris broader Category:Free_software_operating_systems.
- Category:Plan_9_from_Bell_Labs broader Category:Free_software_operating_systems.