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|> Defining apps through X resources sounds like winterp.

You probably mean "WCL", the "Widget Creation Library".

Outdated information below gives an idea of what they do:

WCL: the Widget Creation Library. Basically describes the widget hierarchy
and actions in a resources file; available from fine archive servers
everywhere, including devvax.jpl.nasa.gov (128.149.1.143) in pub/. Wcl
provides a very thin layer over Xt without any internal tweaking. Version 2.7
is in ftp.x.org:~ftp/contrib/devel_tools/Wcl-2.7.tar.Z[gz] [12/94]. (A
tutorial on WCL is available by telnet'ing to techinfo.mit.edu and using
"search iap292".)

WINTERP: an Xlisp-based Motif toolkit (by Niels Mayer) allows for rapid
prototyping and interpretive programming. Its interactive application
development and delivery environment features a high-level object-oriented
interface to the OSF/Motif Widgets and Xtoolkit, a high-level object-oriented
2.5D graphics/animation widget based on Xtango's path-transition animation
paradigm, and facilities for communicating with other Unix processes and
data.  WINTERP's interpreter is "serverized" so that other applications can
communicate with WINTERP-based applications via unix domain sockets, or
optionally, through internet domain sockets. WINTERP's built-in interpreter
is based on XLISP-PLUS, which is a small, fast, portable, C-implemented
interpreter providing a subset of Common-Lisp functionality and a
Smalltalk-inspired object system.  A major new release, WINTERP 2.03, is on
the X11R6 contrib tapes; version 2.03 [7/94] is on ftp.x.org in
contrib/devel_tools/. Info:  winterp-source@netcom.com. See also
http://www.eit.com/software/winterp/winterp.html .

-- 
David B. Lewis      Editor, The Motif Developer: http://www.motifzone.com/tmd/
dbl@motifzone.com   WebWrangler, The Motif Zone: http://www.motifzone.com/