Java

TestNG is a testing framework inspired from JUnit and NUnit but introducing some new functionalities that make it more powerful and easier to use.

DbUnit DbUnit is a JUnit extension (also usable with Ant) targeted at database-driven projects that, among other things, puts your database into a known state between test runs.

Cargo is a thin wrapper around existing containers (e.g. J2EE containers). It provides different APIs to easily manipulate containers. A Java API to parse/create/merge J2EE Modules.

Ant is a Java-based build tool, similar to make, without make's wrinkles.
Jboss
Tomcat
Hibernate

Wicket A simplified framework for building and testing dynamic Web pages

Unit testing Ajax applications using GWT

import stanford.carol.*;
public class OurCarol extends Carol {
    public void run {
    }
     private void turnRight() {
         turnLeft();
         turnLeft();
         turnLeft();
    }
}