Productivity
Time and Date calendar generator
It is part of the popular TimeAndDate.com website, which offers tons of useful date, time, and weather tools.
Toggl
Toggl from Estonia is an extensive time management application with a set of mobile and desktop applications.
IC Project
As befits such an extensive project, describing all the possibilities does not make much sense.
Milanote
An interesting app for notes and inspiration. It offers fewer options than some competing services..
OneNote
OneNote, released for the first time in 2003, is a program used to collect notes, images, screenshots or sound files
Coggle
The Coggle is simple to use, and all the information you need is displayed on the help menu in the corner of the screen.