There is an alternative library thread in this forum if you go back a couple of weeks.

If I recall correctly it is this one.
http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3585164

A forum search for "alternative Poser 8 library" pull up a number of others.

My free alternative is http://www.philc.net/forum/viewtopic.php?t=2922