Common Crawl – publicly available internet-wide crawls, started using Nutch in 2014.

Creative Commons Search – an implementation of Nutch, used in the period of 2004–2006.

DiscoverEd – Open educational resources search prototype developed by Creative Commons

Krugle uses Nutch to crawl web pages for code, archives and technically interesting content.

mozDex (inactive)

Wikia Search - launched 2008, closed down 2009