footnote - A beautiful, fast, and simple note taking app in the style of elementary
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.
The Most Dangerous Writing App - If you stop typing, all progress is lost.
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.
Nikabot - A Slackbot that keeps track of what your team is doing so you don't have to.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.