Clocks - A minimal world clock app for your Mac's menubar
Planny.co - Planny is lightweight Twitter scheduler. Grow faster with calendar planner, multi account management, advanced drafts and analytics.
Clocker - Keep track of people in different time zones
Day Night - A desktop app that kills the procrastination in you.
Every Time Zone - Online tool for keeping up with times around the world.
Gone - An ephemeral to-do list