Productify - Sell your WordPress content using Gumroad
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.
Typeboost - Music stops when you stop typing. Stay focused while writing
Boostnote - Boostnote is an open-source note-taking app.
Additor beta - Pocket and Evernote got a minimal and collaborative baby
Standard Notes - A safe place for your notes, thoughts, and life's work