Elder Sign cooperative Cthulhu-themed dice game and expansions.
Eldritch Horror base game and expansions. A Cthulhu themed cooperative game.
Legendary and Legendary Encounters cooperative deck building games and expansions
Pandemic family of games and expansions.
Descent: Journeys in the Dark (Second Edition) is a dungeon crawl adventure game you can play semi-cooperatively with one player as the Overlord, or cooperatively with the free Road to Legend app.