footnote - A beautiful, fast, and simple note taking app in the style of elementary
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.
Nikatime - A Slackbot that keeps track of what your team is doing so you don't have to.
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.
Writersmob - Get a new writing prompt in your inbox and write everyday
Standard Notes - A safe place for your notes, thoughts, and life's work