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ClickHouse, Inc. · Analytical engines & OLAP

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

Oracle · Relational databases

Oracle's widely deployed open-source relational database server, offered as a GPL community edition and commercial enterprise and cloud editions

GPL-2.0-only WITH Universal-FOSS-exception-1.0Open sourceFreeSelf-hostedBroken

Tiger Data (formerly Timescale) · Relational databases

PostgreSQL extension for time-series data adding hypertables, compression and continuous aggregates, from the company now named Tiger Data

Apache-2.0 AND LicenseRef-Timescale-LicenseOpen sourceFreeSelf-hostedNov 2, 2026

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