AAApache Software Foundation · Data catalogs & formats
In-depth entry 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 DDuckDB Foundation / DuckDB Labs · Analytical engines & OLAP
In-depth entry 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 PPolars (Ritchie Vink and contributors) · DataFrames & array computing
In-depth entry Rust-based DataFrame library with Python, Rust, Node and R bindings offering lazy query optimization, multithreading and Arrow-native memory
MITOpen sourceFreeLocalNov 2, 2026