OpenJMS is an open source implementation of Sun Microsystems's Java
Message Service API 1.0.2 Specification. Features include:

* Point-to-Point and publish-subscribe messaging models
* Guaranteed delivery of messages
* Synchronous and asynchronous message delivery
* Persistence using JDBC
* Local transactions
* Message filtering using SQL92-like selectors
* Authentication
* Administration GUI
* XML-based configuration files
* In-memory and database garbage collection
* Automatic client disconnection detection
* Applet support
* Integrates with Servlet containers such as Jakarta Tomcat
* Support for RMI, TCP, HTTP and SSL protocol stacks
* Support for large numbers of destinations and subscribers