The ParPre library can be found on Netlib:
http://www.netlib.org/and on the ftp site of one of the authors:
ftp://math.ucla.edu/pub/eijkhout/software/parpre-2.0.17.tar.ZThis manual can be read online at
http://www.math.ucla.edu/~eijkhout/reports/parpre_manual/manual.html