Morbid is a STOMP publish/subscribe server with absolutely no potential to cluster. It supports publish/subscribe topics, and runs as a single node.
Development, bundling, and small to medium deployments. Morbid's use of the openly standardized STOMP protocol lets you hit the ground running (one line install), and later switch to a powerful and performant message broker (like the ones listed below) if you reach a point where single node support and limited features aren't cutting it.
If your application requires more features, it is highly recommended that you use one of the following servers (in no particular order). If you know of a deserving project that should be on this list, email directory@morbidq.com.