There is a free, Catan play-alike at games.asbrian.com called Xplorers.
Asosbrain requires free registration (you don’t need to give them your e-mail)
It requires Java 1.2 (you can go to http://games.asobrain.com/faq/start.php to check)
I would be interested in either a standard or Knights and Cities.
I’m free tonight (JUL 22), but am guessing it is too short of a notice.
Is there any interest?