A tool for use with NAND dumps. It will provide all the information about your NAND, and the Key Vault which is contained within. It can also decrypt/encrypt and import/ export various elements of your NAND such as the SMC.
I don't have a wii u anymore to test it myself, but if homebrews are not visible on the wii u menu I think you can press L + R + minus to open the plugin menu, there should be an option called "homebrews on wii u menu" or something similar