Here are some paper models of “Terrors of the Deep” — aquatic horrors to threaten your heroes.
Apathy: The Calling is a free roleplaying game of Cthulhuian horror. The author writes:
Welcome to Apathy:The Calling a Role Playing Game. In this game you play regular folk dealing with the mythos in the only way they can in the modern age, with apathy. As one of the select few for unknown reasons you can hear Dread Cthulhu as he dreams, calling you to commit unspeakable acts. Fortunately you�ve long been accustomed to ignoring inconvenient realities. You fight back with the inertia and apathy, that has defined you as a generation of slackers, miscreants, good for nothings, baby busters and losers.
Apathy, the Role Playing game is a game about the lost generation, everyday life and cthulhu.
Invisible City Productions offers Cthulbeque, a game in which players compete to put the most Cthulhu themed dishes in their serving area.
Scooby v Cthulhu. I wonder which one is going to have to make the sanity check?
Assault on Innsmouth is a set of free wargames rules for involving the Lovecraft Mythos. The players are government forces taking on the horrors in Innsmouth. The forces of the mythos are run by the system. The rules are a heavily modified version of the Two Hour Wargames system. There are also expansions at Board Game Geek.