RabbitMQ is a messaging broker - an intermediary for messaging. It gives your applications a common platform to send and receive messages, and your messages a safe place to live until received. It features include reliability, high availability, Clustering and Federation. RabbitMQ ships with an easy-to use management UI that allows you to monitor and control every aspect of your message broker. There are RabbitMQ clients for almost any language you can think of. 

RabbitMQ - Robust messaging for applications

Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider. 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 and J2EE 1.4.<BR><BR> Its features include:<BR>
 <UL>
	<LI>Supports a variety of Cross Language Clients and Protocols from Java, C, C++, C#, Ruby, Perl, Python, PHP
	<UL>
		<LI>OpenWire for high performance clients in Java, C, C++, C#</LI>
		<LI>Stomp support so that clients can be written easily in C, Ruby, Perl, Python, PHP, ActionScript/Flash, Smalltalk to talk to ActiveMQ as well as any other <A href="http://stomp.codehaus.org/StompConnect" rel="nofollow">popular Message Broker</A></LI>
	</UL>
	</LI>
	<LI>full support for the Enterprise Integration Patterns both in the JMS client and the Message Broker</LI>
	<LI>Supports many advanced features such as Message Groups, Virtual Destinations, Wildcards and Composite Destinations</LI>
	<LI>Fully supports JMS 1.1 and J2EE 1.4 with support for transient, persistent, transactional and XA messaging</LI>
	<LI>Spring Support so that ActiveMQ can be easily embedded into Spring applications and configured using Spring's XML configuration mechanism</LI>
	<LI>Tested inside popular J2EE servers such as Geronimo, JBoss 4, GlassFish and WebLogic
	<UL>
		<LI>Includes JCA 1.5 resource adaptors for inbound &amp; outbound messaging so that ActiveMQ should auto-deploy in any J2EE 1.4 compliant server</LI>
	</UL>
	</LI>
	<LI>Supports pluggable transport protocols such as in-VM, TCP, SSL, NIO, UDP, multicast, JGroups and JXTA transports</LI>
	<LI>Supports very fast persistence using JDBC along with a high performance journal</LI>
	<LI>Designed for high performance clustering, client-server, peer based communication</LI>
	<LI>REST API to provide technology agnostic and language neutral web based API to messaging</LI>
	<LI>Ajax  to support web streaming support to web browsers using pure DHTML, allowing web browsers to be part of the messaging fabric</LI>
	<LI>CXF and Axis Support so that ActiveMQ can be easily dropped into either of these web service stacks to provide reliable messaging</LI>
	<LI>Can be used as an in memory JMS provider, ideal for unit testing JMS</LI>
</UL>

Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider. 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 and J2EE 1.4.

ActiveMQ

The nanomsg library is a simple high-performance implementation of several "scalability protocols". These scalability protocols are light-weight messaging protocols which can be used to solve a number of very common messaging patterns, such as request/reply, publish/subscribe, surveyor/respondent, and so forth. These protocols can run over a variety of transports such as TCP, UNIX sockets, and even WebSocket.  It aims to make the networking layer fast, scalable, and easy to use. 

nanomsg - High Performance Messaging Library

The 0MQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. 0MQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns,
message filtering (subscriptions), seamless access to multiple transport protocols and more.

ZeroMQ - Messaging Library

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RabbitMQ - Robust messaging for applications

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