http://smmdb.ddns.net

Super Mario Maker Database (in short SMMDB) is a website where you can share your Super Mario Maker courses platform independently. Supported platforms are Wii U, 3DS and Cemu. For Cemu there is even a save file editor:
https://github.com/Tarnadas/cemu-smmdb

It also features courses for Super Mario 64 Maker, a popular ROM hack by Kaze Emanuar.

You can also visit us on Discord or on Reddit.