Nikatime - A Slackbot that keeps track of what your team is doing so you don't have to.
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.
Morning Pages for iPhone - Morning Pages for iPhone is an app that helps you reveal your artistic mind and expand your mental and emotional wellbeing.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Exstora - Built-in quick note: save ideas, contacts, interesting facts
Standard Notes - A safe place for your notes, thoughts, and life's work