Wikidata is also worth considering for that task. It is:
* Directly linked from Wikipedia [1]
* The data source for many infoboxes [2]
* Seeded with data from Wikipedia
* More active and integrated in community
* Larger in total number of concepts
Wikidata also has initiatives in lexicographic data [3] and images [4, 5].
On the subject of Cyc: the CycL "generalization" (#$genls) predicate inspired Wikidata's "subclass of" property [6], which now links together Wikidata's tree of knowledge.
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1. See "Wikidata" link at left in all articles, e.g. https://en.wikipedia.org/wiki/Knowledge_base
2. https://en.wikipedia.org/wiki/Category:Infobox_templates_usi...
3. https://www.wikidata.org/wiki/Wikidata:Lexicographical_data/...
4. https://www.wikidata.org/wiki/Wikidata:Wikimedia_Commons/Dev...
5. See "Structured data" tab in image details on Wikimedia Commons, e.g. https://commons.wikimedia.org/wiki/File:Mona_Lisa,_by_Leonar...
6. https://www.wikidata.org/wiki/Property_talk:P279#Archived_cr...
