Streaks - The to-do list that helps you form good habits.
Time Buddy - Time Buddy brings a colorful world clock.
Taskful - Deadlines, meet your match.
Time Zones Converter - Time Zones Converter is an application which as the name implies, is used for converting time zones.
ToDoList - Windows desktop application to stay on top of your daily tasks.
Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.