Tracks remaining turn time in a 4 player (or less) game, intended to be used on a mobile device.
Browse to http://caspark.github.io/turn-timer/ and you'll get a timer for 4 players, 20 minutes each.
The amount of time left per player is currently stored in the fragment in seconds, so you can do very basic configuration this way.
For example, to give 2 players 3 minutes, and the third player 60 seconds, and have no 4th player: http://caspark.github.io/turn-timer/#180,180,60,0
Pro Tip: increase your mobile device's screen timeout: JavaScript stops running if your browser goes to sleep and this implementation naively assumes that never happens ;)