ramp-model is a web-based model representation app. It provides WYSIWYG platform for bootstraping the data architecture of your next awesome app then gracefully provides you with the next step.

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

bootstrap-wysiwyg packaged up for Rails