Knowledge Engine by Wikipedia
wittylama.com
wittylama.com
However, I'd like to add: search is not Wikimedia's core competency. It's an important aspect within the various Wikimedia properties (Wikipedia, Wiktionary, Wikidata, Wikisource, et al) but the knowledge engine has been clearly positioned to the Knight Foundation as a competitor to commercial search engines. The document even states this. And it looks pretty clear that the search was to also involve sources external to WMF sources.
I frankly find it remarkable that the WMF would prioritise search to the exclusion of all the other technical things they need and want to accomplish. And the way this has all been done is breathtaking in its arrogance, secrecy and stupidity.
In my view, and in the view of many others, Lila should resign. Immediately.