This is functions comparison matrix between Tomcat, TomEE and TomEE+:
(Source: http://tomee.apache.org/comparison.html)
1. Tomcat vs TomEE
Tomcat is servlet container. TomEE is boarder than Tomcat.
2. Compare TomEE vs TomEE+
TomEE contains:
CDI - Apache OpenWebBeans
EJB - Apache OpenEJB
JPA - Apache OpenJPA
JSF - Apache MyFaces
JSP - Apache Tomcat
JSTL - Apache Tomcat
JTA - Apache Geronimo Transaction
Servlet - Apache Tomcat
Javamail - Apache Geronimo JavaMail
Bean Validation - Apache BVal
TomEE+
The TomEE Plus distribution adds the following:
JAX-RS - Apache CXF
JAX-WS - Apache CXF
JMS - Apache ActiveMQ
Connector - Apache Geronimo Connector