general/role-playing-game-systems
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Interlock System
Role-playing game system by R. Talsorian Games
One-Roll Engine
Generic role-playing game system developed by Greg Stolze
Steve Perrin's Quest Rules
Tabletop fantasy role-playing game
CODA System
Role-playing game system
Dominion Rules
Tabletop role-playing game system
Generic role-playing game system
Role-playing game system designed to be independent of setting and genre
Dominion Rules Licence
TTRPG free license
Fuzion
Tabletop role-playing game system