> For the complete documentation index, see [llms.txt](https://documentation.grax.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.grax.com/reuse-data/data-lake/open-source-lakehouse.md).

# Open Source Lakehouse

The recommended data architecture with free and open source tools is is:

* Data Format: Parquet
* Storage: Local folders or Minio S3 Compatible
* ETL: Apache Air Flow
* Lakehouse: DuckDB