Deepnote - A collaboration platform for data scientists
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Gyana - Intuitive easy-to-use report and dashboard tool to stop wasting time on repetitive and tedious tasks.
Cron - Cron Calendar.
DataQuest Beta - Codecademy for Data Science
Recollectr - Minimally disruptive, maximally efficient note-taking — record and recall without breaking your flow.