OpenSearch

OpenSearch is an open-source, distributed search and analytics engine that indexes documents for fast full-text search, aggregations, and analytics at scale. It originated as a fork of Elasticsearch and Kibana after Elastic moved those projects off an OSI-approved license, and remains under the Apache-2.0 license, maintained by the OpenSearch Software Foundation with backing from AWS and other companies.

It's commonly used for application and website search, log and observability analytics as a backend for structured log data, and security analytics, with OpenSearch Dashboards providing visualization on top - largely API-compatible with the Elasticsearch ecosystem it descended from, which eases migration for teams already using similar tooling.

OpenSearch is a fit for teams that want Elasticsearch-style full-text search and analytics under a license that stays open-source going forward, and is a direct, Apache-2.0 alternative to the Elasticsearch entry already in this catalog for teams for whom that license distinction matters.