** Doomtool **

Doomtool is a super simple wrapper for classic DOOM that calculates 
the number of frames per second of a DOOM timedemo.

Put doomtool.exe in the same folder as doom.exe. Then type in 
something like this:

    c:\doom > doomtool.exe doom.exe -timedemo demo3

Doomtool will start a DOOM timedemo, intercept realtics from the output, 
and convert them to frames per second.