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.
Notepad Online - Notepad online is a free online notepad website that allows you to create online notes, save notes, text edit, find and replace word, convert cases etc.
Standard Notes - A safe place for your notes, thoughts, and life's work
OnlineNotepad.org - Free browser-based text editor
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.
Shrib - Take notes online. 'Free and no login' or 'AI assistant, visitor stats, privacy and productivity': super simple, with publishing and markdown, share to all devices.