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Stream processing

Run continuous queries, joins and aggregations over event streams.

Changes in this category (RSS)

Side by side

ToolStarsLicenceTermsSelf-hostedLanguageLatestLast push
Apache Flink26kApache-2.0Open sourceYesJavarelease-2.3.02026-10-06
RisingWave9.4kApache-2.0Open sourceYesRustv3.1.02026-10-06
Apache Storm6.7kApache-2.0Open sourceYesJavav3.1.02026-10-03
Hazelcast6.6kOtherOpen coreYesJavav5.7.02026-10-06
Materialize6.4kOtherSource availableYesRustv26.44.12026-10-06
Arroyo5kApache-2.0Open sourceYesRustv0.15.02026-10-06
Timeplus Proton2.3kApache-2.0Open sourceYesC++v3.0.312026-09-20
Bytewax2.1kApache-2.0Open sourceYesPythonv0.21.12026-06-20

8 tools

RisingWave

Event streaming platform for agentic AI. Continuously ingest, transform, and serve event streams in real time, at scale.

Language
Rust
Licence
Apache-2.0
Stars
9.4k
Latest
v3.1.0
Last push
2026-10-06
Hazelcast

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Language
Java
Licence
Other
Stars
6.6k
Latest
v5.7.0
Last push
2026-10-06
Materialize

The live data layer for apps and AI agents. Create up-to-the-second views into your business, just using SQL

Language
Rust
Licence
Other
Stars
6.4k
Latest
v26.44.1
Last push
2026-10-06
Timeplus Proton

The Fastest Unified Streaming SQL Engine in a Single C++ Binary. ⚡ Millisecond latency. 100+ GB/s throughput. Continuously compute real-time context from streams, logs, metrics, events, and CDC.

Language
C++
Licence
Apache-2.0
Stars
2.3k
Latest
v3.0.31
Last push
2026-09-20

What these tools replace