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A system reference document (powered by the Maze)

A 12 word Engine for making 12 word Micro Games

Class Struggle Game SRD

A solo Journaling SRD

rules for crafting using dominoes

A gm-less roleplaying SRD

An SRD for games of risk and survival like No Nut November

Processes for Ruled by Night Games

This is a set of mechanics for playing or creating a d20+d6 role-playing game without corporate attachments.

A System Reference Sheet with the essential rules of The Resistance Toolkit by Grant Howitt & Chris Taylor

The system behind Batter Royale! Come build your own themed Brawl style TTRPG

SRD

A Universal System for Miniature Wargaming

A Creators' Kit for Moonlight on Roseville Beach

The genre-neutral role-playing game of heroic problem solving.

An SRD for probability building diceless gaming!

Little systems for TTRPG designers

Make your own games using Quietus

Dynamic Interactive Pool-based Engine Roleplaying

Standalone negotiation game and system-agnostic bartering module

a solo-journaling game about studying cultures other than your own

Tarot-based SRD for writing single-player TTRPGs

An ultralight system for creating highly improvisational role-playing games.

Cybermetal 2012 Designer Commentary & Creator Kit

A cootie-catcher system built for solo-journaling games.

A setting agnostic Cooperative Storytelling Game + SRD

Make your own stealth based roleplaying games using the engine behind Night Reign

How To Make A Bad Time Game!

Free, open license fantasy SRD for TTRPGs

CORE produces emergent stories that are character-driven, dynamic, and unpredictable