Wii homebrew dev Tantric has released what looks like a very useful tool for all Wiibrew devs out there, new and old alike. It's called libwiigui and, as you can probably infer from the name, is a GUI library for the Nintendo console.
The aim of libwiiGUI is twofold: one, to help structure the design on a complicated GUI; and two, to help Wiibrew devs create sophisticated, feature-rich interfaces. here are some note notes from developer Tantric:
It uses GX for drawing, and makes use of PNGU for displaying images and FreeTypeGX for text. It was designed to be flexible and is easy to modify - don't be afraid to change the way it works or expand it to suit your GUI's purposes! If you do, and you think your changes might benefit others, please share them so they might be added to the project!
Download: Libwiigui v1.0