[Last modified: Feb 02]

Answer: Open Motif is open source, but not public domain.  This following may
be of interest to public domain purists.

LessTif is a freeware version of Motif from the Hungry Programmers.  It is
still in development and is intended to be source code compatible with Motif,
meaning that the same source will compile with both libraries and work exactly
the same.  [Thanks to John W. Carbone, jwc@li.net, Chris Toshok
(toshok@hungry.com), and Jon Fo (jonf@protocol.com)] For more information, see
http://www.lesstif.org/

Tcl/Tk is available for ftp from allspice.berkeley.edu, and although
implemented without Xt, has a "strict Motif" mode. There is also Tix, the Tk
Interface Extension. See:

    http://www.sunlabs.com/research/tcl/
    http://www.cis.upenn.edu/~ioi/tix/tix.html

Strom Sytems (18666 Redmond Way o-2118, Redmond, WA 98052-6725) have a Simple
Toolkit for X-Windows (sic) that appears to follow the Style Guide even though
it doesn't quite look like Motif.

MOOLIT is a USL product that can be runtime switched between the Sun Open Look
and Motif appearance.  It is based on  OLIT 4i.

Interviews is a C++ based product with appearance similar to Motif.  A ftp-
able version of the source code and documentation can be found on
interviews.stanford.edu.  Fresco (http://www.iuk.tu-harburg.de/fresco/) and
ivtools (http://www.vectaport.com/ivtools/) are based on Interviews.

Simon J. Lyall (simon@darkmere.midland.co.nz) reported about a package called:
Xu-lib & Widget Set- a library & widget set to "emulate" the look&feel and the
programming interface of Motif. Contact the author Udo Baumgart
(U.BAUMGART@ldb.han.de) for details.