b2evolution is said to be a \”strong evolution of b2\” [1]. Via that page there is also someone to be found that hacked b2 to be usable for multiblogs [2] and offers free hosting [3].
[1] http://b2evolution.net
[2] http://www.memenetforums.com/viewtopic.php?t=29
[3] http://b2evolution.net/forums/viewtopic.php?t=83
