https://www.bludit.com/
Bludit - Flat-File CMS
Bludit is a web application to build your own website or blog in seconds. It's free, open source, and supports Markdown.
flat file cmsbludit
https://feindura.org/
Welcome | feindura - Flat File CMS
feindura is a Open Source flat file based Content Management System. Perfect for small web sites and just pretty!
flat file cmswelcome
https://getgrav.org/?ref=blog.pimoroni.com
Grav - A Modern Flat-File CMS | Grav CMS
Grav is a Modern, Crazy Fast, Ridiculously Easy and Amazingly Powerful Flat-File CMS.
flat file cmsgravmodern
https://packagist.org/packages/checlou/flat-file-cms-bundle
checlou/flat-file-cms-bundle - Packagist.org
Bundle to add a CMS based on markdown files to an symfony web app
flat file cmsbundlepackagist