Apache Iceberg

Delta Lake

delta-io/delta

Popular

Databricks-originated open table format with ACID transactions, time travel and UniForm Iceberg interop.

Apache Hudi

apache/hudi

Lakehouse table format optimized for upserts, incremental processing and CDC ingestion.

Apache Paimon

apache/paimon

Streaming-first lake format built for Flink, with LSM-based real-time updates.

DuckLake

duckdb/ducklake

RisingNew

Lakehouse format from the DuckDB team that keeps table metadata in a SQL database instead of files.

Unity Catalog

unitycatalog/unitycatalog

Open-source governance catalog for tables, files and AI assets across Delta, Iceberg and more.

Apache Polaris

apache/polaris

Rising

Open-source implementation of the Iceberg REST catalog for multi-engine interoperability.

Lance

lance-format/lance

Rising

Columnar data format built for ML and multimodal data with fast random access and vector indexes.