This is Debian GNU/Linux's prepackaged version of the NASA's CLIPS
expert system.

This package was put together by me, Javier Fernandez-Sanguino Peña
<jfs@debian.org>, from the NASA sources, which I obtained from
http://www.ghg.net/clips/download/source/
http://www.ghg.net/clips/download/executables/examples/
(originally at http://www.ghgcorp.com/clips/download/source/)

Newer releases are now available at Sourceforge:
http://clipsrules.sourceforge.net
The project download page is available at:
http://sourceforge.net/project/showfiles.php?group_id=215471&package_id=260062

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CLIPS, as stated in its FAQ (http://clipsrules.sourceforge.net/FAQ.html#Q4), is freely
distributable:

"
(...)

 4) CAN CLIPS BE REDISTRIBUTED? ARE THERE ANY LICENSING FEES?
-------------------------------------------------------------

Copies of CLIPS executables, documentation, and source code downloaded from the
CLIPS Project on SourceForge are subject to the following license agreement:

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, and/or sell copies of the
Software, and to permit persons to whom the Software is furnished to do so.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR
CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

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"


Previous versions of the FAQ also included the following notice:

CLIPS is released as public domain software and as such you are under no 
obligation to pay for its use. However, if you derive commercial or 
monetary benefit from use of the software or just want to show support, 
please consider making a voluntary payment based on the worth of the 
software to you as compensation for the time and effort required to 
develop and maintain CLIPS. Payments can be made online at 
http://order.kagi.com/?JKT