What private search engine do you use? Why?

I use:<p><a href="https:&#x2F;&#x2F;infinitysearch.co" rel="nofollow">https:&#x2F;&#x2F;infinitysearch.co</a><p>It&#x27;s Private and it&#x27;s open-source! also, it&#x27;s a search engine (not meta-search-engine, even if they retrieve results from others they have their own crawler and index)

I&#x27;m not sure if it&#x27;s necessarily private, but YaCy has been awesome. It&#x27;s a decentralized search engine that has surprisingly good results in my experience.<p><a href="https:&#x2F;&#x2F;yacy.net&#x2F;" rel="nofollow">https:&#x2F;&#x2F;yacy.net&#x2F;</a>