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ClickHouse

ClickHouse, Inc. · Analytical engines & OLAP

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Open-source columnar OLAP database server for fast aggregations over billions of rows, with MergeTree storage, SQL and a managed ClickHouse Cloud

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Elasticsearch

Elastic N.V. · Vector databases

In-depth entry

Distributed search and analytics engine on Apache Lucene with full-text, aggregations, vector search and ES|QL; triple-licensed AGPL, SSPL and Elastic License

AGPL-3.0-only OR SSPL-1.0 OR Elastic-2.0Open sourceFreeSelf-hostedNov 2, 2026

PM2

Keymetrics (Unitech) · Infrastructure & provisioning

In-depth entry

Production process manager for Node.js and other long-running programs with cluster mode, log handling, restart policies and boot-time startup scripts

AGPL-3.0-onlyOpen sourceFreeLocalSelf-hostedNov 2, 2026

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