Open Source Alternatives to Apache Flink

A stream processing framework that performs stateful computations over data streams. It provides layered APIs including SQL and the DataStream API to handle both bounded batch data and unbounded live data streams. The software supports event-driven applications, real-time analytics, and ETL data pipelines. It is designed for high throughput and low latency using an in-memory computing architecture with a scale-out design for large state management. The system includes correctness guarantees such as exactly-once state consistency, event-time processing, and sophisticated late data handling. It is deployed flexibly with support for high-availability setups and savepoints for recovery. This framework is used by developers to build applications that ingest events from multiple streams and react by triggering computations or external actions.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Apache Flink give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 1 open source alternative to Apache Flink. The most popular is Timeplus Proton. It uses the Apache-2.0 license and ships an official Docker image.