Osprey Roleplaying SystemLight-Regelwerk Enthält eine knappe Beschreibung des Regelsystems.
Open Source Roleplaying Engine. An open content roleplaying game that I have designed (incomplete¸ i.e. "a work in progress" [Thx to UncleBear.com]
A role-playing engine released under an Open Content license. It uses a point-based¸ skill-based system. 28 pages PDF.