Quill 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. Check: 'https://github.com/adnanmirza1/quill-js-rails-adnan' for documentation

Imparavi wysiwyg editor for Rails 3.1+

ActiveModel validator that ensures Word-tags hasn't been accidentally pasted into WYSIWYG attributes.