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.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Standard Notes - A safe place for your notes, thoughts, and life's work
Wallcat - Enjoy a new, beautiful wallpaper, every day.
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.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android