Apache Nutch · Nutch is an open source web-search software. It builds on Hadoop, Tika and Solr, adding web-specifics, such as a crawler, a link-graph database etc.
Apache Tika core · This is the core Apache Tika™ toolkit library from which all other modules inherit functionality. It also includes the core facades for the Tika API.
OpenSearchServer · OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.
Algolia Search API Client for Java · Java client for Algolia Search API
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