This tool allows you to create, edit, and remove any item in a very advanced and detailed way by either writing the value of each property into the bytes manually or choosing a sample from the dropdowns.
It currently only works with the latest version of CubeWorld (0.1.1), but I plan to add support for all versions except for the ZirconRealms client.
I still need to get my hands on the pre-release client, so if anyone can help me out with that, please contact me.