6 tools
Apache Software Foundation · Data catalogs & formats
Language-independent columnar in-memory format and libraries that let DuckDB, Polars, pandas, Spark and databases exchange tables without copying
Apache Software Foundation · Analytical engines & OLAP
Extensible Rust query engine built on Apache Arrow offering SQL and DataFrame APIs, Parquet readers and an optimizer for embedding in data systems
Apache Software Foundation · Analytical engines & OLAP
Distributed data processing engine with DataFrame and SQL APIs in Python, Scala, Java and R, plus structured streaming and MLlib
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
Kùzu Inc. (company acquired; project archived) · NoSQL & key-value stores
Embedded property-graph database with Cypher, vector and full-text search; MIT-licensed but archived in October 2025 after the company was acquired
Polars (Ritchie Vink and contributors) · DataFrames & array computing
Rust-based DataFrame library with Python, Rust, Node and R bindings offering lazy query optimization, multithreading and Arrow-native memory
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