With the recent release of Counter-Strike: Global Offensive's Game State "library" release, we've decided to release a Node.js script that counts down the bomb timer automatically, along with some cool stats if you decide to share it with friends.
To install BombTimer, you must install Node.js (duh), along with the following libraries:
$ npm install http
$ npm install fs
$ npm install socket.io
Then, move gamestate_integration_bombtimer.cfg to your CS:GO cfg folder.
Once that's done, run the script via
$ node timer.js
And just open index.html locally.