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Apache Kafka

apache/kafka

Popular

Distributed event-streaming platform; Kafka 4 removed ZooKeeper in favor of KRaft.

Apache Flink

apache/flink

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Stateful stream processing engine with exactly-once semantics, also capable of batch workloads.

Confluent Cloud

confluent.io

Popular

Fully managed Kafka and Flink service from Kafka's creators, with connectors and governance.

Redpanda

redpanda-data/redpanda

Kafka API-compatible streaming engine in C++ with no JVM or ZooKeeper.

Amazon Kinesis

aws.amazon.com

AWS's managed service for collecting and processing real-time data streams.

Apache Pulsar

apache/pulsar

Multi-tenant, geo-replicated messaging and streaming with tiered storage.

RisingWave

risingwavelabs/risingwave

Rising

Postgres-compatible streaming database that maintains incrementally updated materialized views in SQL.