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Manticore Search
Full-text search and data analytics, with fast response time for small, medium and big data (alternative to Elasticsearch).
Typesense
Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use.
Aleph
Tool for indexing large amounts of both documents (PDF, Word, HTML) and structured (CSV, XLS, SQL) data for easy browsing and search. It is built with investigative reporting as a primary use case.
Amgix
Amgix (a-MAG-ix) is a modular distributed hybrid search system
Apache Solr
Enterprise search platform featuring full-text search, hit highlighting, faceted search, real-time indexing, dynamic clustering, and rich document (e.g., Word, PDF) handling.
Citadel
Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more.