Java Open Reliable Asynchronous Messaging (JORAM) is an open-source (Gnu LGPL) message broker which is certified to fully implement the Java Message Service

Java Message Service

The Java Message Service API is a Java Message Oriented Middleware API for sending messages between two or more clients. JMS is a part of the Java Platform, Enterprise Edition, and is defined by a specification developed under the Java Community Process as JSR 914...

 API 1.1 (JMS 1.1). JORAM is available for download since May 2000.

JORAM provides advanced features like clustering and high-availability, C/C++ Xoram API and Java ME client. It implements the Advanced Message Queuing Protocol (AMQP).

JORAM is the default JMS provider in JOnAS

JOnAS

JOnAS is an open-source implementation of the Java EE application server specification, developed and hosted by the ObjectWeb consortium ....

 Application Server (Java EE 5 certified), it is also used in OW2 PEtALS

OW2 PEtALS

Petals ESB is an open source ESB developed by the OW2 Consortium. It is a tool for implementing a service-oriented architecture . It is standard, modular, and physically distributed, to adapt to large scale infrastructures....

distributed ESB (JBI) and in OW2 SCA infrastructure FraSCAti.

Enterprise support for JORAM is available from ScalAgent D.T..