Implement open source Headless magento CMS

I’m looking for a open source headless CMS solution that can be integrated on a Magento 2 website.

Key features required:

- easy and intuitive CMS interface
- Content preview (desktop/mobile)
- content scheduling
- content publishing based on category tree
- publish content on a specific bloc/widget
- archive old articles
- SEO friendly urls
- Ability to publish content based on customer group


Please share your suggested options that matches with the requirement.
Accordingly we can schedule a demo