Best Open-source Stream Processing Engines tools

RisingWave

Real-time streaming platform with native Iceberg lakehouse support

Apache Beam

Unified model for batch and streaming data pipelines

Apache Flink

Unified engine for high-throughput, low-latency stream and batch processing

Redpanda Connect

High-performance resilient stream processor with declarative pipelines

Materialize

Real-time SQL platform delivering up-to-the-second data views

Apache Storm

Distributed real-time stream processing engine for low-latency analytics

Apache Spark

Fast, unified engine for large-scale data analytics

Pathway

Unified Python framework for real‑time, batch, and LLM pipelines

Apache Samza

Scalable, fault-tolerant stream processing with Kafka and YARN