GlassFish Tools Bundle for Eclipse is an Eclipse distribution containing Eclipse Java EE 6 tooling. GlassFish 3 Java EE 6 is preconfigured, and optionally a JDK 1.6 all-in-one single installer is provided for XP, Mac OS X, OpenSolaris, or Linux. The GlassFish plugin for Eclipse provides the Application Server WTP adapter to enable Java EE development.
The Java Engine for Testing (JET) is a system for running distributed automated tests. It has been used by Sun for testing the High Availability DataBase (HADB), JavaDB, PostgreSQL, Memcached, and the MySQL Cluster Manager. JET should be a good way to write your tests if the product you want to test is distributed or has a client/server architecture, if it is natural for you to write the tests in Java, and if you want to invest time in developing tests and abstractions for later reuse.