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Apache Airflow

Apache Software Foundation · ETL/ELT & orchestration

Python workflow orchestrator for scheduling and monitoring DAGs of tasks, with hundreds of provider packages and managed offerings from several clouds

Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026

Apache Kafka

Apache Software Foundation · Messaging & queues

In-depth entry

Distributed event streaming platform with durable, partitioned, replayable logs, Kafka Connect connectors and Kafka Streams processing

Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026

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

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

dbt

dbt Labs (Fivetran + dbt Labs) · ETL/ELT & orchestration

In-depth entry

SQL-first transformation framework that compiles templated models, tests and documentation into warehouse tables; open-source Core plus a commercial platform

Apache-2.0Open sourceFreemiumLocalSelf-hostedNov 2, 2026

Prefect

Prefect Technologies, Inc. · ETL/ELT & orchestration

Python workflow orchestration library and server where decorated functions become observable, retryable flows, with Prefect Cloud as hosted option

Apache-2.0Open sourceFreemiumLocalSelf-hostedRedirected

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