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ClickHouse

ClickHouse, Inc. · Analytical engines & OLAP

In-depth entry

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

pgvector

Andrew Kane (pgvector project) · Vector databases

In-depth entry

PostgreSQL extension adding vector types, distance operators and HNSW/IVFFlat indexes for similarity search inside the database

PostgreSQLOpen sourceFreeSelf-hostedNov 2, 2026

PostGIS

PostGIS Project Steering Committee (OSGeo) · GIS & mapping

In-depth entry

Spatial extension for PostgreSQL adding geometry, geography and raster types with indexing and hundreds of SQL functions

GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026

PostgreSQL

PostgreSQL Global Development Group · Relational databases

In-depth entry

Open-source object-relational database server with a large extension ecosystem (PostGIS, pgvector, TimescaleDB) and broad SQL coverage

PostgreSQLOpen sourceFreeLocalSelf-hostedBroken

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