For stuffs that isnt available on that list, you can use Wii VC Injector Script to convert iso into installable WUP format, you have to source your own iso.
It is an official platform where you can install paid & free games available for. Browse the largest Collection of 3DS CIA Format Game Downloads For free There is. For Wii game you can download them from Wii U USB helper Virtual Console Wii section. Loading times on the Wii U have been a huge complaint, this will be a hugely pleasant surprise for current owners and give potential new Wii U gamers one less reason to keep the money in their wallet. The official method to download games is by using the Wii Shop. We’ll provide a more thorough report of updates, changes, and improvements that we see from this update, but preliminary results are showing that it makes your Wii U super fast. Wii U USB helper will let you download Wii U games directly to your PC and even copy them over to your SD / Micro SD card. And we know what happens when you stop your download midway so if it’s taking a long time… leave it be! We’ll warn you now though: as more and more people notice it’s live and start their downloads, estimated download times have been climbing. Others are having luck by triggering the notification on entrance of the eShop.
If you’re not receiving any notification, simply enter system settings and search for it manually. That’s right… it’s officially live as reported by gobs of members on Wii U Forums! Stop what you’re doing, boot up your Nintendo Wii U, and snag yourself the latest Wii U firmware update.