The Void is a free RPG with a science fiction/ Lovecraft setting.
RPG Horror
Convicts & Cthulhu
Convicts and Cthulhu is a Call of Cthulhu supplement set in the Australian Penal Colony. From the product description:
Convicts & Cthulhu is a sourcebook designed to allow Call of Cthulhu Keepers and players to run scenarios and campaigns set in the penal colonies of early Australia. It particularly targets the historical period from 1795 to 1810, a time in which law and order played second-fiddle to greed and corruption. This was the depraved era which led ultimately to Australia’s first (and only) military uprising: the Rum Rebellion!
Dice Chucker Universal RPG
Dice Chucker is a rules light RPG.
Dice Chucker is a rules-lite system that puts a new twist on rolling dice! A lot of players like rolling dice and Dice Chucker is here for them. You will find that Dice Chucker is chock full of dicey goodness! The rules here are pretty simple and straight forward and the details are meant to be handled by players and GMs as suits their tastes and the storyline. Dice Chucker’s rules can be adapted to virtually any genre you like: fantasy, sci-fi, horror, western, etc. Let your imagination be your guide!
Fourteen Free Microlite 20 RPG Variants
Microlite 20 is a set of minimalist RPG rules designed for compatibility with Old School Dungeons and Dragons materials, as well as the d20 OGL. Fourteen free Microlite 20 variants are available at the link.
Eldritch World RPG
Eldritch World is an
… Apocalypse World hack / Trail of Cthulhu mash-up submitted as a 24 hour rpg entry.
Explore the world of H.P. Lovecraft with a fun, rules-light, yet brutal and unforgiving RPG engine Powered By The Apocalypse. Make friends, kill monsters, go insane. Sounds like an average Saturday night.