There's a multiplayer mod for The Witcher 3 so you can turn one of the finest singleplayer RPGs of all time into an MMO instead

A modder called rejuvenate, previously responsible for the Wolven Trainer (which bundles together freecam, a time-of-day changer, a wardrobe editor, and a bunch of other tweaks), has finally done it. The Witcher 3 is multiplayer now.

Witcher Online is a mod that lets you connect to a server full of other witchers (and Yennefers and Dandelions and the like) who can hang out together and emote via console commands. Before you get your hopes up for the kind of co-op you get in Skyrim Together...