Thread:Extension talk:Wikibase Client/Wikibase? Wikibase Client? Wikidata build? huh? what?/reply

I'd guess Wikibase Client is [//git.wikimedia.org/tree/mediawiki%2Fextensions%2FWikibase/HEAD/client this].

http://comments.gmane.org/gmane.org.wikimedia.wikidata/5353 is related.