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Genre Neutral Rules Lite TTRPG

A Fast & Flexible Toolbox RPG

Draw, describe, decide - action!

A modern classic fantasy TTRPG using two six-sided dice

A simple, hackable, one die RPG system.

The open-source basic rules of the 4C System / Four Color System

Guide for making games with trick taking combat, based on Transgender Deathmatch Legend.

The 0D0P tables let you use any writing to roll a D2-D20.

Licence for Cage of Sand inspired games

Nano (12-word) TTRPG featuring multiple challenge difficulty classes, and player character proficiencies.

A ruleset for fantasy roleplaying.

A simple ruleset for gritty medieval games.

Create your own content based on Firelights

A Creative Commons rules system for TTRPGs

Minimalist tabletop RPG

Evolution in game design

How to design for Descended from the Queen games

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

A gm-less roleplaying SRD

A guide to making solo tarot RPGs

A toolkit for creating card-based solo journaling games.

Free, open license fantasy SRD for TTRPGs

Ultralight Old School RPG Rules

Tarot-based SRD for writing single-player TTRPGs

Cleaned up PDF for the wonderful vs M Engine SRD

SRD en español de la Mark of the odd