Apache Spark
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
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
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Dagster
Dagster Labs · ETL/ELT & orchestration
Asset-oriented Python orchestrator that models pipelines as software-defined data assets with lineage, checks and a hosted Dagster+ option
Apache-2.0Open sourceFreemiumLocalSelf-hostedRedirected
NumPy
NumPy developers (NumFOCUS) · DataFrames & array computing
Foundational Python library for n-dimensional arrays, vectorized math, linear algebra, random numbers and the array API used by the scientific stack
BSD-3-ClauseOpen sourceFreeLocalBroken
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