Most of all, we would like to thank all volunteers for their contributions, small or large, to Wikidata, other Wikimedia projects, uncounted SMW-based wikis, and the open knowledge and freeculture movements in general. Without their energy, optimism, and dedication, nothing described here would exist.
This text has benefited from the input of external reviewers, whom we wish to thank for their thoughtful comments and useful corrections: Danese Cooper, James Forrester, Mark Greaves, Erik Möller, Pavel Richter, and Max Völkel. Any remaining mistakes and idiosyncrasies are our own.
Photograph Fig. 4 is by Phillip Wilke, Wikimedia Deutschland, published under CC-BY-SA 3.0, via Wikimedia Commons.[1] Photograph Fig. 9 is by the Open Data Institute, published under CC-BYSA 2.0 via Flickr.[2] Photograph Fig. 11 is by JarrahTree, published under CC-BY-SA 2.5 Australia via Wikimedia Commons.[3]
This work was partly supported by Bundesministerium für Bildung und Forschung (BMBF) through the Center for Scalable Data Analytics and Artificial Intelligence (ScaDS.AI), and by BMBF and DAAD (German Academic Exchange Service) in project 57616814 (SECAI, School of Embedded and Composite AI).
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