CKEditor - Real-time collaborative future-ready rich text editor
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Quill - Powerful, API-driven rich text editor
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
Editor.js - A block-styled editor with clean JSON output