Neverwinter Nights
BioWare is now primarily known for its Star Wars, Dragon Age, and Mass Effect games, but the studio has created many of the best Dungeons & Dragons ever made. One of these is inarguably Neverwinter Nights, which is set in D&D’s popular Forgotten Realms world. The campaign tells the story of a terrible plague and a mysterious cult, but Neverwinter Nights shipped on PC with a full set of tools for players to create their own custom content, including full campaigns. And since the game was initially conceived as an MMO, it also had – uncommonly, for Dungeons & Dragons games – terrific online multiplayer.