LDL is available from http://www.cise.ufl.edu/research/sparse/ldl/

LDL Version 1.0 (Dec. 31, 2003), Copyright (c) 2003 by Timothy
A. Davis. All Rights Reserved.  

LDL License:
Your use or distribution of LDL or any modified version of LDL
implies that you agree to this License. 

  THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
  EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK. 

Permission is hereby granted to use or copy this program, provided
that the Copyright, this License, and the Availability of the
original version is retained on all copies. User documentation of
any code that uses LDL or any modified version of LDL code must
cite the Copyright, this License, the Availability note, and "Used
by permission." Permission to modify the code and to distribute
modified code is granted, provided the Copyright, this License,
and the Availability note are retained, and a notice that the code
was modified is included. This software was developed with support
from the National Science Foundation, and is provided to you free
of charge.


TAUCS is available at http://www.tau.ac.il/~stoledo/taucs.  It is a
library of sparse linear solvers and is covered by the LGPL.


Metis is available at http://www-users.cs.umn.edu/~karypis/metis/.
It is a family of multilevel partioning algorithms copyright by the
Regents of the University of Minnesota and is used with permission.