RPG Now has a free horror RPG module called Dead of Night: Night of the Santa Claws. It’s designed for the Dead of Night RPG, but no doubt could be modded for any other system.
Danger 50,000 Volts: The Zombie Edition is a hysterical send up of both zombie movie culture and those second rate documentaries that show up on cable.
Dark World War is a set of free wargames rules — actually pay what you want — for playing WWI games that include demonic and mythological creatures.
Vaporoare is a role playing game, but as is the case with such, it’s full of ideas for skirmish type miniatures games. The author writes:
Vaporoare is a role-playing game of weird science and mad magi in Victorian-era Europe. It imagines a world where Jules Verne wrote technical manuals for ether machines instead of fiction; Mary Shelley penned the autobiography of Dr. Frankenstein, and H. P. Lovecraft didn’t know what he was getting into. It is the world described by Edgar Allan Poe, Lord Dunsany and J. R. R. Tolkien. Europe is alive with races of fiction: elves dwarves and gnomes. These people have lived together since the beginning of time, and now they face their greatest challenge: the Industrial Revolution. Magick is dying, and technology is on the rampage.
Ironhands has some evil trees he built from kids toys, and a page explaining how he used an electric fog machine to add some great effects to his tabletop games.
Now how about some fog through the spooky trees.