Gone - An ephemeral to-do list
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Streaks - The to-do list that helps you form good habits.
wnr - Better than pomodoro, this timer app balances work and rest.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!