Are there any well developed, relatively successful, and - in your own experience - well playable, unofficial (and Creative Commons licensed) RPGs based on Eclipse Phase's world and/or system, as of today*?*
The authors of EP have voiced their hope - more than once - to see such games. I wonder if anyone has taken advantage of the opportunity yet. (I think the game mechanics would lend themselves quite well to unofficial adaptations of various SF movies and computer games.)