Knotable - Cut the noise out of busy email threads
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.
Indigrid - Plain text outliner with side-by-side views.
Standard Notes - A safe place for your notes, thoughts, and life's work
Kirjoitusalusta - Based on open source Etherpad. Finnish language. Supports HTTPS.
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.