Apache OpenEJB and Apache TomEE are born from the same project and community. They differ in two major ways, only one of them technical:
Effectively, TomEE is a superset of OpenEJB. They share the same code and TomEE grew out of OpenEJB.
|Java ServerPages (JSP)|
|Java ServerFaces (JSF)|
|Java Transaction API (JTA)|
|Java Persistence API (JPA)|
|Java Contexts and Dependency Injection (CDI)|
|Java Authentication and Authorization Service (JAAS)|
|Java Authorization Contract for Containers (JACC)|
|Java API for RESTful Web Services (JAX-RS)|
|Java API for XML Web Services (JAX-WS)|
|Java EE Connector Architecture|
|Java Messaging Service (JMS)|
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