In-memory key-value database with persistence, pub/sub, and Lua scripting; runs as a standalone daemon or cluster.

High-performance C library for asynchronous message passing and distributed computing patterns.

C99 shared library implementing MQTT 3.1.1 and MQTT 5 specifications for publish-subscribe messaging.

Erlang-based message broker and streaming platform for distributed systems.

Apache Kafka C/C++ client library for high-performance producers and consumers.

Distributed event streaming platform and message broker written in Java, requiring JDK runtime.