This is a page of websites, forums, and resources for the Amber Diceless RPG based on Roger Zelazny's Amber novels.
These are a couple of the games I played in (first as Aiden, then as Zulla), which are now defunct. Currently, only Encyclopedia Infernalis is active. There are a number of excellent PBP games being hosted there.
And here is a link to an old Telnet setup for Amber MUD games - STILL ACTIVE apparently!