Hello,
Just wanted to spell out for anyone looking that a Linux port of Avadon (for multiple Linux distributions, no less) is available at:
http://www.gameolith.com/game/avadon-black-fortress/
Just in case anyone searches this forum (like I did, after searching the Spiderweb Software web site directly) looking for specific information on Linux versions of these great games.
I had a nice afternoon yesterday of playing Avadon on my Ubuntu Linux desktop.
(Moderator, please remove/edit this post if there is any reason should not directly mention this.)
Hope this helps someone!