DraftJS Plugins 2.0 is plugin architecture for Draft.js now including rich text editing toolbars and features like drag'n'drop, alignment or resize for Atomic Blocks like images.
Version 1.0 already included Slack-like Emoji autocompletion or Facebook-like mentions.
Quill 1.0 is a free, open source WYSIWYG editor built for the modern web. With its modular architecture and expressive API, it is completely customizable to fit any need.
ProseMirror is a toolkit for building rich-text editors on the web.
CKEditor 5 is a set of ready-to-use rich text editors created with a powerful framework that enables you to create any kind of text editing solution and include real-time collaborative editing inside.