Edtr.io - Intuitive WYSIWYG web editor, open source & fully adaptable.
Dabble Writer - Writing software for novelists.
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Manuskript - Open-source tool for writers.
MathType - The Professional version of Equation Editor- MathType is a powerful interactive tool for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, and for TeX, LaTeX, and Math…
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding