Jmol is an extension I blogged about in the past. What Jmol does is show what chemicals, proteins look like. It does not only do a good job visualising, it really lightens up pictures that are otherwise rather dull.
Installing Jmol proved to be interesting, it has a prerequisite called StubManager. This is a tool that is essential for a whole range of extensions and it is required to be installed before all the tools that make use of it.
Jmol itself was interesting as well; it installed itself in a directory called MediaWiki and ia directory with java stuff. For the Wikiation Extension Testing Environment, we are looking for a standard way of installing the stuff because that also allows for clean un-installs. Everything is now in the Jmol directory, we now only have to make it work.