I was bored so I created a bombtimer. You just click a button of your choice and then you get a beep, which means that its counting. You get a Sound at 10 seconds, 5 seconds and 1 second like you know from many public servers.
You can also change the bombtime (for ESL: 35; for MM: 45). Should also work with any other game.
Screen:
Video (currently in upload):
Status:
UNDETECTED, because it doesn't interact with the game, but always USE AT YOU OWN RISK!
VT: