Customizing
From ScapeFX Wiki
ScapeFX is usable without doing any customization to the client. However, the main feature of the ScapeFX client is that it is highly customizable for your own game. It is possible to modify it both graphically and technically for the features of your game.
This is done by writing plugins in Java and adding them to the startup .jnlp file in .jar files.
Check out the Plugins page for more information about how to write plugins.
