Have you ever been interested in what extensions are available for Firebug? If yes, take a look at what I have found. Frankly, I was quite surprised how many Firebug extensions already exists out there.
Ravenous is a Java based webserver which does not in any way attempt to implement any parts of the Java Enterprise Edition standard. Instead it aims to provide you, the developer, with a simple easy to grasp way of developing solid high performance web sites in Java.