Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Any.DO - The #1 task management app used by over 11 million people globally, Any.do is your free mobile and online task manager for Android, iPhone, Web and more.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Microsoft To-Do - Task management tool
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows