I've been working hard on a new controller emulator and it's finally ready for release! Classic+ is a replacement for Classic Controller and Nunchuk controllers in the same vein as GC+. It comes with a Wii homebrew app called Classic+ Configurator that handles calibration, updating, and other settings.
All of the code and designs needed to build one are available on GitHub. I will continue updating the GitHub if any changes need to be made and will post updates here. Feel free to discuss or ask questions about the device in this thread.