Apache Spark
Apache Software Foundation · Analytical engines & OLAP
Distributed data processing engine with DataFrame and SQL APIs in Python, Scala, Java and R, plus structured streaming and MLlib
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
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dbt
dbt Labs (Fivetran + dbt Labs) · ETL/ELT & orchestration
SQL-first transformation framework that compiles templated models, tests and documentation into warehouse tables; open-source Core plus a commercial platform
Apache-2.0Open sourceFreemiumLocalSelf-hostedNov 2, 2026
Metabase
Metabase, Inc. · BI & dashboards
Self-hostable BI tool with a no-code question builder, SQL editor, dashboards and embedding; AGPL open-source edition plus commercial Pro and Enterprise
AGPL-3.0Open sourceFreeSelf-hostedNov 2, 2026
MySQL
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
pgvector
Andrew Kane (pgvector project) · Vector databases
PostgreSQL extension adding vector types, distance operators and HNSW/IVFFlat indexes for similarity search inside the database
PostgreSQLOpen sourceFreeSelf-hostedNov 2, 2026
PostgreSQL
PostgreSQL Global Development Group · Relational databases
Open-source object-relational database server with a large extension ecosystem (PostGIS, pgvector, TimescaleDB) and broad SQL coverage
PostgreSQLOpen sourceFreeLocalSelf-hostedBroken
TimescaleDB
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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