XDMCP server for Linux

[Marvin [GodfatherofSoul] Bellamy]

I'm trying to find the Linux equivalent of an XDMCP server like MI/X, 
Hummingbird, or Excursion.  Is anyone away of any products?  After 
getting my home network going, I realized I didn't know how to bring up 
my network server's X display from my Linux workstation.  I'm not 
interested in VNC, though it might be the only option I have.  As cool 
as XDMCP is, I'm surprised at how little open source software is a 
available on the server/workstation/initiator side.