🔎 Open source distributed and RESTful search engine.

AI + Data, online. https://vespa.ai

Apache Lucene open-source search software

JVector: the most advanced embedded vector search engine

Apache Solr open-source search software

Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

Free and Open Source, Distributed, RESTful Search Engine

Fess is very powerful and easily deployable Enterprise Search Server.

Streamline Your Telegram Searches: Find Channels, Groups, and Chat History Effortlessly.

Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted)

Open-source Enterprise Grade Search Engine Software

Spark-Crawler: Apache Nutch-like crawler that runs on Apache Spark.

The offical home of searchcode-server where you can run searchcode locally. Note that master is generally unstable in the sense that it is not a release. Check releases for release versions https://github.com/boyter/searchcode-server/releases

Pure java realize search engine, try to directly hit the user's search for answers.

Full Text Search Engine Server for Java, Lightweight embeddable, powered by iBoxDB.

IPFS Storage service with search capability

Tokenizer support Lucene5/6/7/8/9+ version, LTS

Norconex Crawlers (or spiders) are flexible web and filesystem crawlers for collecting, parsing, and manipulating data from the web or filesystem to various data repositories such as search engines.

Query preprocessor for Java-based search engines (Querqy Core and Solr implementation)

Search Quality Evaluation Tool for Apache Solr & Elasticsearch search-based infrastructures