Copernic doesn't meet the minimum requirements to be ranked in Emerging Solutions while Lucene is ranked 9th in Indexing and Search. Copernic is rated 0.0, while Lucene is rated 8.0. On the other hand, the top reviewer of Lucene writes "One of the best open source date indexing tools available, with support for various popular file formats like PDF, HTML, etc". Copernic is most compared with , whereas Lucene is most compared with Microsoft FAST, OpenText IDOL and Sinequa.
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