Directory

6 tools

Apache Software Foundation · Data catalogs & formats

Language-independent columnar in-memory format and libraries that let DuckDB, Polars, pandas, Spark and databases exchange tables without copying

Apache-2.0Open sourceFreeLocalNov 2, 2026

ClickHouse

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

DuckDB

DuckDB Foundation / DuckDB Labs · Analytical engines & OLAP

In-process analytical SQL database that queries Parquet, CSV and Arrow data directly from Python, R, Node or the CLI

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Elasticsearch

Elastic N.V. · Vector databases

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

OpenSearch

OpenSearch Software Foundation (Linux Foundation) · Vector databases

Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation

Apache-2.0Open sourceFreeSelf-hostedBroken

Polars

Polars (Ritchie Vink and contributors) · DataFrames & array computing

Rust-based DataFrame library with Python, Rust, Node and R bindings offering lazy query optimization, multithreading and Arrow-native memory

MITOpen sourceFreeLocalNov 2, 2026

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