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. Its features include: 
 <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

HornetQ is the new ultra high performance enterprise grade messaging system from JBoss community. It is a multi-protocol, embeddable, very high performance, clustered, asynchronous messaging system. It offers server replication and automatic client failover to eliminate lost or duplicated messages in case of server failure. It also provides a comprehensive management API to manage & monitor servers. HornetQ supports STOMP (simple text oriented messaging protocol), JMS bridge, Client side load balancing, Duplicate message detection, Message expiration, Scheduled messages and lot more.

HornetQ is the new ultra high performance enterprise grade messaging system from JBoss community. It is a multi-protocol, embeddable, very high performance, clustered, asynchronous messaging system. It offers server replication and automatic client failover to eliminate lost or duplicated messages in case of server failure. It also provides a comprehensive management API to manage & monitor servers.

Hornetq - Enterprise messaging

Apache RocketMQ is a distributed messaging and streaming platform with low latency, high performance and reliability, trillion-level capacity and flexible scalability.
 
Its features include: 
<ul>
<li>Pub/Sub messaging model</li>
<li>Scheduled message delivery</li>
<li>Message retroactivity by time or offset</li>
<li>Log hub for streaming</li>
<li>Big data integration</li>
<li>Reliable FIFO and strict ordered messaging in the same queue</li>
<li>Efficient pull&amp;push consumption model</li>
<li>Million-level message accumulation capacity in a single queue</li>
<li>Multiple messaging protocols like JMS and OpenMessaging</li>
<li>Flexible distributed scale-out deployment architecture</li>
<li>Lightning-fast batch message exchange system</li>
<li>Various message filter mechanics such as SQL and Tag</li>
<li>Docker images for isolated testing and cloud isolated clusters</li>
<li>Feature-rich administrative dashboard for configuration, metrics and monitoring</li>
</ul>

Apache RocketMQ is a distributed messaging and streaming platform with low latency, high performance and reliability, trillion-level capacity and flexible scalability.

RocketMQ - Distributed messaging and streaming data platform

A lightning fast, transactional, file-based FIFO for Android and Java. QueueFile is a lightning-fast, transactional, file-based FIFO. Addition and removal from an instance is an O(1) operation and is atomic. Writes are synchronous; data will be written to disk before an operation returns. The underlying file is structured to survive process and even system crashes and if an I/O exception is thrown during a mutating change, the change is aborted.

Tape - A lightning fast, transactional, file-based FIFO for Android and Java.

Pulsar is a distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API. It is horizontally scalable (Millions of independent topics and millions of messages published per second), Strong ordering and consistency guarantees, Low latency , REST API, Geo Replication and lot more.

Pulsar - Distributed pub-sub Messaging System from Yahoo

ActiveMQ Apollo is a faster, more reliable, easier to maintain messaging broker built from the foundations of the original ActiveMQ. It accomplishes this using a radically different threading and message dispatching architecture. Like ActiveMQ, Apollo is a multi-protocol broker and supports STOMP, AMQP, MQTT, Openwire, SSL, and WebSockets.

Apache Apollo - ActiveMQ's next generation of messaging 

Jafka mq is a distributed publish-subscribe messaging system cloned from Apache Kafka.
 
Its features include: 
<ul>
<li>Persistent messaging with O(1) disk structures that provide constant time performance even with many TB of stored messages.</li>
<li>High-throughput: even with very modest hardware single broker can support hundreds of thousands of messages per second.</li>
<li>Explicit support for partitioning messages over broker servers and distributing consumption over a cluster of consumer machines while maintaining per-partition ordering semantics.</li>
<li>Simple message format for many language clients.</li>
<li>Pure Java work</li>
</ul>

Jafka mq is a distributed publish-subscribe messaging system cloned from Apache Kafka.

Jafka - A fast and simple distributed publish-subscribe messaging system (mq)

Nakadi is a distributed event bus broker that implements a RESTful API abstraction on top of Kafka-like queues. It provides abstract event delivery via a secured RESTful API, Enable convenient development of event-driven applications and asynchronous microservices, Efficient low latency event delivery.

Nakadi - A distributed event bus that implements a RESTful API abstraction on top of Kafka-like queues

Aeron is an efficient reliable unicast and multicast transport protocol. The Aeron protocol is designed to be run directly over many different types of transmission media, including shared memory/IPC, InfiniBand/RDMA, UDP, TCP, Raw IP, HTTP, WebSocket, BLE, etc.

Aeron - Efficient reliable unicast and multicast transport protocol

Pulsar is a distributed pub-sub messaging platform with a very flexible messaging model and an intuitive client API. It has run in production at Yahoo scale for over 3 years, with millions of messages per second across millions of topics. It is Horizontally scalable, Low latency, High throughput, Multi-tenancy, Geo-replication, Transparent batching of messages, Transparent handling of partitioned topics, REST API for provisioning, admin and stats and lot more. 

Apache Pulsar - Distributed pub-sub messaging platform

MBassador is a light-weight, high-performance event bus implementing the publish subscribe pattern. It is designed for ease of use and aims to be feature rich and extensible while preserving resource efficiency and performance. The core of MBassador is built around a custom data structure that provides non-blocking reads and minimized lock contention for writes such that performance degradation of concurrent read/write access is minimal.

MBassador - Light-weight, high-performance event bus implementing the publish subscribe pattern

A high-throughput, persistent, distributed, publish-subscribe messaging system based on memory mapped file and Thrift RPC. 
Its design objectives are: 
<ol>
<li>Fast: close to the speed of direct memory access, both produding and consuming are close to O(1) memory access.</li>
<li>Persistent : all data in the system is persisted on disk and is crash resistant.</li>
<li>High-throughput: even with modest hardware Luxun can support handreds of thousands of messages per second.</li>
<li>Realtime : messages produced by producer threads should be immediately visible to consumer threads.</li>
<li>Distributed : explicit support for partitioning messages over Luxun servers and distributing consumption over a cluster of consumer machines while maintaining per-partition ordering semantics.</li>
<li>Multiple clients support : use <a href="http://thrift.apache.org/">Thrift RPC</a> as communication infrastructure, easy to generate different clients for different platforms.</li>
<li>Flexible consuming semantics : supports typical consume once queue, fan out queue, even supports consume by index when needed.</li>
</ol>

A high-throughput, persistent, distributed, publish-subscribe messaging system based on memory mapped file and Thrift RPC.

Luxun - A high-throughput, persistent, distributed, publish-subscribe messaging system based on memo

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