ZenNode 0.98a:  An extremely fast BSP 
  & REJECT builder for OS/2, DOS, and
  Win32. Merges multiple WADs into a 
  single WAD file.  Rebuilds NODES,
  REJECT, and/or BLOCKMAP for any or 
  all levels in a WAD file.  Supports 
  DOOM, DOOM II, Heretic, and HEXEN.
  New special effects support.