Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

wnr - Better than pomodoro, this timer app balances work and rest.

Shutter - Shutter is a feature-rich screenshot program.

Hourglass - Hourglass is the most advanced simple countdown timer for Windows.

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image

Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows