Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Time Zones Converter - Time Zones Converter is an application which as the name implies, is used for converting time zones.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Time Zone Converter - Time Zone Converter is an online productivity tool to calculate exact time across time zones.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
World Clock - World Clock is an app that lets you see the time of any city in the world.