During my poll of developers about their Bugzilla settings, I was told
that the current maintainers of the following two extensions do not have
time to take care of them any longer and they need someone to step up
and maintain them:
EasyTimeline
APC
For what it is worth, EasyTimeline is deployed on WMF wikis (See
http://hexm.de/58 for an example from mlwiki).
Thanks,
Mark.