RPGNow is running a September Setting Sale with thousands of titles in the mix. That's a lot to sort through. I'm going to try to pick out some of my personal favorites that are OSR or system neutral over a small series of posts (although one or two may creep in from outside those parameters ;)
Strange Stars OSR Rule Book - "STRANGE STARS is a setting where modern transhuman science fiction meets classic 70s space opera. Now you can explore the STRANGE STARS universe in Sine Nomine Publishing's acclaimed Stars Without Number or similar Old School Rennaissance-derived games! Join a salvage mission to steal ancient tech from the wreck of a deranged sophont warship. Scavange parts from giant ancient robots on Gogmagog. Cross swords with a Zao Pirate in hard vacuum. Experience a galaxy of adventure with STRANGE STARS OSR!"
The Islands of Purple-Haunted Putrescence - "This is a weird, science fantasy, gonzo campaign setting and wilderness hex-crawl for old school fantasy roleplaying games. The Islands of Purple-Haunted Putrescence is a guide for helping you run crazy sandbox scenarios in a lost world of Snake-Men, dinosaurs, and mutant sorcerers... an exotic and deadly region possessed by a demonic, purple-hued god of ruin and consumption. If you're into the OSR or just want some strange 5e flavoring, give this a try. It's not your usual adventuring environment, but it will be memorable!"
Guidebook to the Duchy of Valnwall Special Edition - Note - I have a small adventure inside this book - "The Guidebook to the Duchy of Valnwall (Special Edition) is a Labyrinth Lord™ supplement that expands on the critically acclaimed Guidebook to the City of Dolmvay and details the people, layout, and government of the Duchy of Valnwall. The Duchy is presented in broad strokes and is open to customization. It was specifically designed to give Labyrinth Lords a convenient and familiar fantasy setting to place their adventures. The Guidebook to the Duchy of Valnwall (Special Edition) is largely open content. Small Niche Games would like to encourage professional and amateur publishers to use the Guidebook as a shared fantasy setting and set their commercial adventures within the Duchy of Valnwall. Labyrinth Lords (and publishers) should feel free to change, add, or remove any of the information in this book to better suit his or her own game."
Points of Light - "War horns wail and perilous realms cry out for heroes! Four settings, each detailed and mapped, ideal for novices launching their first campaign, or veteran GMs looking to challenge
Red Tide: Campaign Sourcebook and Sandbox Toolkit - In this book a Labyrinth Lord will find all that is required to run a sandbox game of adventure in the Sunset Isles. In addition to the races, classes, and sorcery of this savage land, a referee will find special tools and resources for creating shadowed courts of quarreling nobility, cities rife with struggle, wild border settlements that cry out for the help of heroes, and dark places in the earth known only to the dead and the damned. These tools will aid not only campaigns in the Sunset Isles, but also those games set in other lands of savage mystery and bloodstained blades. Expanding on the tag system found in the free Stars Without Number sci-fi role-playing game, Red Tide includes more than fifty new tags for fantasy cities and borderland settlements, along with more than 25 pages of GM resources including culture-specific name and place lists, unkeyed blank maps for quick sandbox use, four pages of room dressing and treasure possibilities, and a new "diagram dungeon" method of quick dungeon generation with a worked example. 7.99 5.35
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