- Referata Wikidata — launched 2010; for testing 'wikidata' from the Referata wiki farm;
- Wikimedia Wikidata — launched early 2013; from the Wikimedia Foundation (WMF);
- Uncyclomedia UnData — launched early 2019; from the Uncyclomedia Foundation;
- See also
- OmegaWiki — launched 2006; a comprehensive multilingual dictionary, and the first ever user of wikidata.
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