• Freebase
  A global knowledge base: a structured, searchable, writeable and editable database built by a community of contributors, and open to everyone. It could be described as a data commons.
  in Public bookmarks with communities databases freebase reference semantic_web tools wiki by 18 users
• Thinkbase
  A 'visual wiki'. It is based on Freebase, an open, shared database of the world's knowledge - in other words a 'Semantic Wiki'. Thinkbase uses a visualization tool (Thinkmap) to create an interactive visual representation of the contents and semantic relationships in Freebase.
  in Public bookmarks with communities databases freebase reference semantic_web tools visualization wiki by 3 users

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