DataHub is an open-source metadata platform providing search, discovery, and end-to-end lineage across warehouses, pipelines, and BI tools via push-based ingestion.

OpenMetadata is an open-source metadata platform combining catalog, lineage, data quality tests, and collaboration on a single schema-first foundation with many connectors.

Great Expectations (GX) is an open-source Python framework for declaring, validating, and documenting data quality expectations inside pipelines.