- patchbay - Message queue implemented over HTTP. (Lobsters)
- ElasticMQ - Message queue system, offering an actor-based Scala and an SQS-compatible REST (query) interface.
- Disque - Ongoing experiment to build a distributed, in-memory, message broker.
- rmq - Message queue system written in Go and backed by Redis.
- BullMQ - Premium Message Queue for NodeJS based on Redis.
- Sol - An MQTT broker from scratch