Apache OpenEJB and Apache TomEE are born from the same project and community. They differ in two major ways, only one of them technical:
- TomEE incorporates two additional projects; Tomcat and MyFaces
- TomEE, as a name, more easily implies the breadth of technologies included
Effectively, TomEE is a superset of OpenEJB. They share the same code and TomEE grew out of OpenEJB.
| Tomcat | TomEE | TomEE JAXRS | TomEE+ | OpenEJB | |
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| Java Servlets |  |
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| Java ServerPages (JSP) | |
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| Java ServerFaces (JSF) | |
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| Java Transaction API (JTA) | |
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| Java Persistence API (JPA) | |
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| Java Contexts and Dependency Injection (CDI) | |
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| Java Authentication and Authorization Service (JAAS) | |
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| Java Authorization Contract for Containers (JACC) | |
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| JavaMail API | |
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| Bean Validation | |
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| Enterprise JavaBeans | |
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| Java API for RESTful Web Services (JAX-RS) | |
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| Java API for XML Web Services (JAX-WS) | |
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| Java EE Connector Architecture | |
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| Java Messaging Service (JMS) | |
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