Inkay is an Aroma/WUPS plugin that patches various Nintendo Network URLs on a Wii U to use Pretendo Network instead. It also (for the time being) bypasses SSL verification in most cases.
Inkay does not currently include the game-specific patches present in Nimble. These will be implemented soon™.
Project grape is in beta. It shouldn't brick your Wii U. Its made for https://grape.helioho.st/ but the original Inkay is at https://github.com/PretendoNetwork/Inkay You can't compile without Devkitpro and Wut. The WPS file will be added in a later date.
Inkay is only supported on the release version of Aroma configured for autoboot/coldboot. For Tiramisu, see Nimble.
Inkay's patches are all temporary, and only applied in-memory without modifying your console. The SSL patch, while also temporary, could reduce the overall security of your console while active - this is because it no longer checks if a server is verified. However, this does not apply to the Internet Browser, where SSL still works as expected.
See Issues.