Kestrel vs VerneMQ: What are the differences?

Kestrel: Simple, distributed message queue system. Kestrel is based on Blaine Cook's "starling" simple, distributed message queue, with added features and bulletproofing, as well as the scalability offered by actors and the JVM; VerneMQ: VerneMQ is a distributed IoT/MQTT message broker. VerneMQ is a distributed MQTT message broker, implemented in Erlang/OTP It's open source, and Apache 2 licensed. VerneMQ implements the MQTT 3.1, 3.1.1 and 5.0 specifications..

Kestrel and VerneMQ can be categorized as "Message Queue" tools.

Some of the features offered by Kestrel are:

• Written by Robey Pointer
• Starling clone written in Scala (a port of Starling from Ruby to Scala)
• Queues are stored in memory, but logged on disk

On the other hand, VerneMQ provides the following key features:

• Open Source, Apache 2 licensed
• QoS 0, QoS 1, QoS 2
• MQTT v5.0 fully implemented

Kestrel and VerneMQ are both open source tools. Kestrel with 2.8K GitHub stars and 326 forks on GitHub appears to be more popular than VerneMQ with 1.76K GitHub stars and 189 GitHub forks.