As H13N.H3N recently noted, Ktoon has risen from the ashes, but there are even more animation efforts out there. I’ve recently stumbled across a couple I thought I’d mention in case anybody’s interested:
Ella - The name stands for the Elegant Light Linux Animator and it can apparently already export swf files. The download link on the site seems to be wrong but I found its launchpad page at launchpad.net/ella .
MyPaint Animation Patch - This is an addition to the already nice painting program known as MyPaint. Like Ella, this one seems to be in the very early stages, but it looks interesting.
Matt