Hellbound has been arround for quite some time now,
but for one reason or another it was always left behind.
There is this repository based on developing hellbound
SVN: http://svn.l2game.msk.ru/hellbound
Trac: http://trac.l2game.msk.ru/hellbound
Forum on l2jserver is http://www.l2jserver.com/forum/viewtopic.php?f=69&t=21642