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.
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.
Notebag - A keyboard-focused note-taking app that gets out of your way
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Roam Research - A note-taking tool for networked thought
Standard Notes - A safe place for your notes, thoughts, and life's work