SonicMQ
- Message server, delivering scalability, extensive connectivity, and comprehensive security for business-critical communication across the extended enterprise. Consulting, education and technical support, datasheet, and view a Flash demo.
- http://www.sonicsoftware.com/

Reeve Consultants Limited
- Specialise in computer and organisational communications, including middleware, distributed databases, image archiving, change management and workflow; and have led major projects based on MQSeries.
- http://www.reeveconsultants.demon.co.uk/

Message Oriented Middleware - InterPlay
- Message-Oriented Middleware (MOM) product for Microsoft Windows application developers, providing messaging capability between applications via a powerful ActiveX component.
- http://www.edt-wn.com/products/activem/

MQSeries.net
- Thread-based discussion forums for MQSeries-related topics. Online repository for freely-distributable code. Covers MQSI, Workflow, Everywhere, and all APIs.
- http://www.mqseries.net/

Softwired iBus
- A scalable, "pure Java" message queuing middleware. Softwired iBus is fully JMS (Java Message Service) compatible, and is used by eBay, UBS, the US Department of Defense, Xerox, and many others.
- http://www.softwired-inc.com/

Jiiva - RapidMQ Messaging & Queuing for the Mac
- The first messaging and queuing product designed for Mac OS X. Download RapidMQ beta now.
- http://www.jiiva.com/

SwiftMQ.COM
- Small and light JMS - compatible message queueing system. Binaries are free, source for sale
- http://www.swiftmq.com/

Dovetail Systems, LLC.
- Supplies advanced messaging applications to the global financial services community and other information-intensive industries.
- http://www.dovetailsys.com/

Creative Science Systems, Inc.
- NetZyme Enterprise is Java (1.1 and2)- and C (ADA, Fortran, Cobol, and Perl)- based, has both message- and object-oriented middleware, has an open platform with extensible API, integrated development environment, RDBMS connection manager, fault tolerant E
- http://www.creativescience.com/

4 Tier Software - OpenMOM message broker
- The new generation of message broker for building multi-tiered applications. Cooperation of Business services developed in Java, Visual Basic, Delphi or C++, are performed by OpenMOM message brokers under the form of plug&play communicating component
- http://www.4tier.com/