Statamic

 Statamic  is a commercial flat-file CMS built on PHP, with Antlers templating, and YAML + Markdown for storing articles and pages (YAML for metadata, Markdown for the content), some IndieWeb building blocks support, but no known IndieWeb examples.

IndieWeb Examples
If you know of some please note them here!

Previous Examples

 * 0 has migrated from Statamic to Grav since 2019-01-06.

Addons

 * Webmentions adds Webmention support via Webmention.io to Statamic. GitHub repo