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.
Troll Lord Games offers a free, standalone RPG adventure using their SIEGE Engine game system. From the description:
FREE OPEN & PLAY! All you need to start playing now! Introductory Adventure using the Siege Engine. Everything included.
Hell is an unkind place. A sprawling megalopolis of twisted streets and ramshackle buildings piled one on top of the other, clawing their way to height’s unseen where the Lords of Hell rule. Here the harvested souls of evil labor as slaves, doomed to eternal torment. Bound to a world of suffering, always yearning for a world beyond their own. Those wicked, and who are able, seek to flee this city of the damned and do so with whatever tool they can: greed, violence, avarice. Fleeing Hell is the only goal.
But to do so, these souls must pass the Borderhounds. They are Bounty Hunters set on the edge of forever who hunt down wayward souls and throw them in, or out, of Hell. Led by grim faced Brimstone, these Borderhounds are the bane of the damned.
Now you can join the Borderhounds!!
Brimstone and the Borderhounds is a complete, standalone Role Playing Game using the tried and tested Siege Engine, crafted by veteran game designer Jason Vey. Fight devils, demons and more in your hunt to capture Hell’s wayward souls!
The Wrath of Zombies blog has a set of free RPG rules for Mass Combat. While written for the author’s own Thundarr style game, they are applicable to a wide variety of rules and settings.
Rob Conely of A Bat In The Attic blog has written a document on making a Fantasy Sandbox.
Creating a fantasy world? Running a medieval fantasy RPG? Here’s a great article on Medieval Demographics, based on the Paris tax lists of 1292 and other original sources.