MVC

 No.  Name  Home  Description
 1  Spring   http://www.springframework.org/  
 2  J2EE  http://java.sun.com/j2ee/index.jsp  
 3  XWork  http://www.opensymphony.com/xwork/  
 4  PicoContainer  http://www.picocontainer.org/  
 5  Struts  http://struts.apache.org/  
 6  MS .Net  http://www.microsoft.com/net/  

Testing

 No.  Name  Home  Description
 1  JUNIT  http://junit.sourceforge.net/ 
 http://www.junit.org/index.htm
 
 2  DBUNIT  http://dbunit.sourceforge.net/  

Object/Relational

 No.  Name  Home  Description
 1  Hibernate  http://www.hibernate.org/  
 2  iBATIS  http://ibatis.apache.org/  
 3  OJB  http://db.apache.org/ojb/ ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java Objects against relational databases.
 4  OJB.Net  http://ojb-net.sourceforge.net/  
 2  Torque  http://db.apache.org/torque/

Torque is a persistence layer. Torque includes a generator to generate all the database resources required by your application and includes a runtime environment to run the generated classes.