Countdown Screensaver is a Mac OS X screensaver to countdown to your big day. Minimalistic design, useful, and 100% free.
Hurry is an app for Android that creates beautiful countdowns to the days and events that you look forward to in the form of beautiful widgets.
TikTok is a customizable countdown timer that lives in your Chrome browser.
Tool to calculate and visualize the 'free time' remaining in your life.
This helps put into perspective sensitivity to things like working hours, commute, etc and how those factors stack up into a big time sink over long periods.