Meanwhile the sources of Motif® are "available", however
usage of the OpenGroup®'s implementation does neither match the
definition nor any more general definition of "free"
usage, it's in fact rather limited. Most striking problem
might be that it can not be used on almost all platforms!
In this situation there's obviously still need for LessTif to provide a LGPL'ed version of this interface which can be used on the vast majority of operating systems (only limited by technical problems upon porting; it likely builds on more systems than OM). Once the OpenGroup® would release OpenMotif under a license compatible with a common OpenSource definition LessTif _might_ become obsolete.
So we encourage people still to use, test and enhance LessTif. Until the details have been worked out any code contributors shouldn't look very closely at the OpenGroup®'s sources to avoid any possible license violation.