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PGMB is a PostgreSQL-based message broker and event log with a type-safe TypeScript client, supporting queues, retries, automatic table events, SSE streams, and webhooks.

QPub Server is a self-hostable real-time messaging server offering pub/sub Channels over WebSocket and REST, plus job queues with workers and webhooks. It supports tenant isolation, rate limits, API key auth, and runs on NATS JetStream, Redis and Postgres or CockroachDB.

Redpanda Connect is a declarative stream processor that moves data between many sources and sinks via a single YAML file, with CDC connectors, Bloblang mapping, at-least-once delivery, and built-in metrics and tracing.

NATS is a CNCF cloud-native messaging system; nats-server is its high-performance server, runnable on-premise, in the cloud, at the edge or on a Raspberry Pi, with over 40 client language implementations.