This is a small C program (GPL) written many years ago by Alexander Kourakos.
It supports XPM skins and displays hours, minutes and seconds. It is well
suited for window manager docks like FvwmButtons(1). In NsCDE it is applied with
a skin similar to original one, but slightly bigger and with more clear edges
and colors. Default can be used from
/usr/local/share/icons/CDE
or even
replaced with a Solaris version with picture of the globe with red hands for
hours and minutes and white for seconds. If clicked, it will try to execute
firefox by default (which appears doesn't work if FVWM is started under some
desktop environment like MATE).
With NsCDE binary for Linux is provided by
default in /usr/local/bin
.