Apache Solr was the answer for Motley Fool
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This article from CIO Magazine describes why Motley Fool, a provider of investing information, chose Apache Solr to make their archive of over 25 million documents, images, and discussion threads easily available for their users. The reasons for choosing Apache Solr over other search engines includes the ability to index a larger amount of documents, as well as having the ability, thanks to it being open source, to tweak the code to refine the search results to obtain more relevant results for the users.
Comintelli’s Knowledge XChanger is powered by Apache Solr, making it an interesting choice for companies that want to encorporate more information management abilities in addition to enterprise search.