Andy Pavlin's Collection

DISM32 -
  A VERY powerful and complete disassembler for VAX executables. It knows
most structures in VMS executables and will return them to you symbolically.
It can disassemble drivers or system images as well as normal programs.

ETHERMON -
  Monitor your ethernet, mostly symbolically. Even allows cuts, recording 
of selected traffic, etc. and knows ALL the protocols (almost) known to man
on Ethernet!

From Andy Pavlin, GE RSD