Apache Kafka
Apache Software Foundation · Messaging & queues
Distributed event streaming platform with durable, partitioned, replayable logs, Kafka Connect connectors and Kafka Streams processing
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
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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
marimo
marimo (acquisition by CoreWeave announced October 2025) · Notebooks & interactive computing
Reactive Python notebook stored as a plain .py file that re-runs dependent cells automatically and doubles as a script or web app
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
Project Jupyter
Project Jupyter (NumFOCUS) · Notebooks & interactive computing
Open-source computational notebook ecosystem: the .ipynb format, kernels for Python, R and Julia, JupyterLab and Notebook interfaces and JupyterHub
BSD-3-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026
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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