Xapian is an Open Source Search Engine Library, released under the GPL. It's written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C#, Ruby, Lua and Erlang (so far!)
Xapian is a highly adaptable toolkit which allows developers to easily add advanced indexing and search
... [More] facilities to their own applications. It supports the Probabilistic Information Retrieval model and also supports a rich set of boolean query operators. [Less]
OpenSearchServer is a powerful, enterprise-class, search engine program. With the web user interface, the crawlers (web, file, database, ...) and its REST API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows
... [More] and Linux/Unix/BSD
Multilingual lemmatization, spellcheck, stop words, synonyms, facet, filters, web crawler, database crawler, local and remote file system crawler, documents indexation with OCR, REST with XML or JSON and SOAP API. [Less]
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