Your Life In Weeks is a neat tool I saw on Felix's Twitter account, visualize your life so far in an Excel. Make every day count.
Lifespan tracks the progress of the deadlines that matter most. We all need a reminder once in a while that life is short. Using a progress bar to track the time you have left can be a powerful motivator.
“Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life." - Steve Jobs