Ideas and code borrowed from Bud-froggy Productions®, all honor to him ;)

Announces killstreaks: multi kill, ultra kill, killing spree, monster kill and godlike.

The difference with the original plugin: 

IMPORTANT:
Place the .wav files in %mod%/sound/misc.
Add these lines to all your .res files in the %mod%/maps folder:

  sound/misc/multikill.wav
  sound/misc/ultrakill.wav
  sound/misc/killingspree.wav
  sound/misc/monsterkill.wav
  sound/misc/godlike.wav

If a .res doesn't exist, create one, for example: de_dust.res. I've included all .res files for the maps in Counter-Strike 1.4.