TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
BlankPage - Stay motivated to write, and finish your story
Froala Editor V2 - A beautiful modern WYSIWYG HTML text editor
Novelize - Novelize is an online novel writing app designed to keep authors on track.
Edtr.io - Intuitive WYSIWYG web editor, open source & fully adaptable.
Manuskript - Open-source tool for writers.