Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Year In Progress - Day / month / year progress bars 📊 in your taskbar
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Memento Mori - A little stoic reminder page
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
ICYMT - Watch as time progresses on every new tab.