OpenJMS

Open source implementation of Java Message Service API 1.1 specification. Supports point-to-point and publish-subscribe messaging models with guaranteed message delivery. Features synchronous and asynchronous message delivery, JDBC persistence, local transactions, message filtering using SQL92-like selectors, authentication, and administration GUI. Can run in embedded or standalone mode with connectors for TCP, SSL, HTTP, HTTPS, and RMI. Integrates with servlet containers like Tomcat.