Adding ActiveMQ

README.md

@@ -297,6 +297,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
 * [NSQ](http://nsq.io/) - A realtime distributed messaging platform.
 * [RabbitMQ](http://www.rabbitmq.com/) - Robust, fully featured, cross distro queuing system.
 * [ZeroMQ](http://zeromq.org/) - Lightweight queuing system.
+* [ActiveMQ](https://activemq.apache.org/) - Open source java message broker
 
 ## RDBMS
 *Relational DBMS.*