Dabble Writer - Writing software for novelists.
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding
Froala Editor V2 - A beautiful modern WYSIWYG HTML text editor
Manuskript - Open-source tool for writers.
Edtr.io - Intuitive WYSIWYG web editor, open source & fully adaptable.