Yacy

Distributed and RESTful search engine.

Enterprise search platform featuring full-text search, hit highlighting, faceted search, real-time indexing, dynamic clustering, and rich document (e.g., Word, PDF) handling.

Blazing fast, typo-tolerant search engine optimized for developer happiness and ease of use.

Full-text search and data analytics, with fast response time for small, medium and big data (alternative to Elasticsearch).

Powerful and easily deployable Enterprise Search Server.

Hybrid search engine built for flexible deployment and real-world messy data.