lucene

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

Apache Lucene open-source search software

Open Source ASP.NET MVC Enterprise eCommerce Shopping Cart Solution

Apache Lucene.NET is an open-source full-text search library written in C#, ported from the Apache Lucene project.

Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.