Google runs a web page called AllForGood which helps people find opportunities to volunteer in various organizations in their neighbourhood. In the beginning, the search in the site was updated from Google’s crawlers crawling several volunteer webpages.
However, when designing a tighter integrated, more real-time search, they turned to Apache Solr. On their blog they say
“…our search engine is now powered by SOLR, an incredible open source project that will allow us to provide higher quality and more up-to-date opportunities.”
What a super testimony for Solr’s strenths and maturity!