It’s not an RPG, but I always recommend PowerWash Simulator. It’s one of those games where you don’t have to pay too much attention to the game and can watch stuff on your phone.

Aside from that, maybe World of Warcraft private server like ChromieCraft.

There’s also Starbound, Terraria, Fallout 3 & New Vegas, the Portal and Borderlands games, Half-Life 2 just received an update.