HarmoniousWorlds is a DIY, universal role-playing framework that enables real-world statistics, trading card games, and role-playing games to interact in a consistent fashion.   

The Harmonious Worlds is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. This means it is free to use for non-commercial purposes and anyone can contribute.  All you need is some paper, dice, and pens to begin!