ApostropheCMS

Apostrophe is a powerful website builder platform built on an enterprise open source CMS. Apostrophe offers in-context live editing and dynamic visual design tools with multisite enablement. At its core is an extensible and modular system in a full stack JS environment ready for traditional or headless deployment. At last, a balance between the developer and editor experience, where side projects thrive and businesses boom.

https://apostrophecms.com/