XDM ThemeStuff
From ThorxWiki
XDM is the standard very very minimalistic login/greeter program for the X Windows System.
Some years ago, back when KDM, GDM, etc were brand new ideas, Nemo instead took a different tack and created some scripts to theme the XDM window - via the use of shell scripts and Xresources. This was "XDM themestuff"
XDM themestuff is very abandoned now - in that it has not updated or even looked at in years... should anyone want the latest version made, please contact Nemo.