If you really want to get to know the Eclipse platform then these tools are for you. The Preference Explorer and the Extension Explorer give you a good picture for how the system is configured. You get a list of all the defined extensions in the Eclipse system – great for debugging. You can also see all of the Eclipse preference store and what values and preferences the different plug-ins use. This doesn’t mean any of this is really “public” information or documented by the component owners but it is a good way to see how other developers use extensions and preferences and what ones are available.
You also get the Property Broker Monitor and Topology Peek tools for assisting in debugging your composite applications and components.