Nintendont is a GameCube backup game launcher on Wii and Wii U vWii. Games can be on Sd or USB or you can even use retail and backup discs. For all the info on everything about Nintendont see the opening post here on GBATemp.
To use Nintendont just download it and put it in its apps folder like this - SD:/apps/Nintendont/boot.dol. Then make sure to use AbdallahTerro's Mastermod WiiFlow version. Download it here.
WiiFlow Nintendont game options coming soon.