This countdown timer tracks how long it will be until people running BIP-110 nodes will be forked off the Bitcoin network, most likely to a dead network that produces no new blocks.

For background info, see A Layman's Guide to BIP-110 and It's Knot a Serious Project

To see the status of BIP-110 miner signaling, check this chart.
To compare current block heights reported by different node implementations, check bitnod.es.

This tool is 100% open source code

The Knotzi Death March Countdown can be found at https://github.com/jlopp/knotzi-death-march

Libraries

Flip: https://github.com/pqina/flip

Twitter Bootstrap: http://getbootstrap.com/