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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Dask
Dask developers (open-source community) · Distributed & parallel computing
Python library for parallel and distributed computing that scales pandas, NumPy and custom task graphs from a laptop to a cluster
BSD-3-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026
Open MPI
Open MPI consortium · Distributed & parallel computing
Open-source implementation of the MPI message-passing standard used to run tightly coupled parallel programs across the nodes of a cluster
BSD-3-Clause-Open-MPIOpen sourceFreeLocalSelf-hostedBroken
Ray
Ray project (Anyscale and contributors) · Distributed & parallel computing
Open-source Python framework for distributing tasks, actors and ML workloads across a cluster, with libraries for data processing, training, tuning, serving and reinforcement learning
Apache-2.0Open sourceFreeLocalSelf-hostedBroken
vLLM
vLLM project (originated at UC Berkeley Sky Computing Lab) · Local LLM inference & serving
High-throughput LLM inference and serving engine with PagedAttention, continuous batching, quantization and an OpenAI-compatible server for GPU and accelerator clusters
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
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