These are the compiled classes you need to create your own wizard. It also comes with source for an example wizard so that you have an example to work from. The code is currently compiled by a Java v1.4 compiler so it can be used by that version and any newer ones. I do not currently plan on changing the required version although it could conceivably run on an older VM if necessary.
The API for the framework can be viewed online or it can be downloaded from the links below.