Please note:

The following copyright and no-warranty information is included as part of the CM1 code. Please read this information before downloading CM1.

CM1 Numerical Model, Release 19.3  (cm1r19.3)
25 August 2017

Copyright (c) 2000-2017 by George H. Bryan, National Center for
Atmospheric Research, Boulder, Colorado, USA.  All Rights Reserved.

Permission is granted for an individual or institution to use CM1
provided that:

    1) CM1 is not redistributed beyond your immediate working group
       without permission.
    2) Credit is given for any publications that result from the
       use of CM1.
    3) This copyright and no-warranty information is kept in a conspicuous
       location and that all references to this notice are maintained.
    4) The user agrees to the following NO WARRANTY notice.

                             NO WARRANTY

CM1 is provided by George Bryan on an "AS IS" basis and any warranties,
either express or implied, including but not limited to implied warranties
of noninfringement, originality, merchantability and fitness for a particular
purpose, are disclaimed.  Neither George Bryan or the National Center for
Atmospheric Research (NCAR) will be obligated to provide the user with any
support, consulting, training, or assistance of any kind with regard to the
use, operation, and performance of CM1 nor to provide the user with any
updates, revisions, new versions, error corrections, or "bug" fixes.  In no
event will George Bryan and/or NCAR be liable for any damages, whatsoever,
whether direct, indirect, consequential, or special, which may result from
an action in contract, negligence, or other claim that arises out of or in
connection with the access, use, or performance of CM1, including
infringement actions.

If you agree to these terms, you can download the code here.