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Document summarization system. By adding document content to system, user queries will generate a summary document containing the available information to the system.
Eventseer is a search engine for computer science conference and workshop events. It digests call-for-paper emails and extracts and indexes relevant information.
Xapian is a Search Engine Library, written in C++ with bindings for Perl, Python, PHP, Java, Tcl, C# and Ruby. Xapian allows you to easily add advanced indexing and search facilities to your applications. See www.xapian.org for more information.