Go For OSS Projects
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Fess is Java based full text search server provided as OSS product. You can install and run Fess quickly on any platforms, which have Java runtime environment.
River Web is Elasticsearch plugin to crawl web sites and extract contents. CodeLibs project also provides several other Elasticsearch plugins.
Empros is Event Management and Processing System. Empros runs on a Servlet container which supports Servlet 3.0.