Apache ActiveMQ is a popular and powerful open source messaging server. Apache ActiveMQ is fast, supports many cross language clients and protocols, comes with easy to use enterprise integration patterns and many advanced features while fully supporting JMS 1.1, J2EE 1.4, AMQP 1.0.
Apache ActiveMQ Artemis has been working towards adding ActiveMQ 5.x equivalent features and client compatibility improvements:
The OpenWire protocol module has been completely refactored, improvements include:
Cluster connections can now be configured using ActiveMQ 5.x style URI
Equivalent implementations of all ActiveMQ 5.x JAAS modules are now available in Artemis
Artemis has initial support for database backed Journal.
HA Replication, STOMP protocol module, File Journal Storage.
Currently 20 PMC members
Committer base changes
Currently 56 committers
5.13.2 was released on Fri Mar 04 2016
Mailing list activity
(Most of this information is pulled from reporter.apache.org)