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.
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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.
Manticore Search
Full-text search and data analytics, with fast response time for small, medium and big data (alternative to Elasticsearch).
MeiliSearch
Ultra relevant, instant and typo-tolerant full-text search API.
OpenSearch
Distributed and RESTful search engine.
Typesense
Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use.