Butter is a headless CMS loved by engineers. See https://buttercms.com for details.

Sunrise is a Open Source CMS

This analyzes a url and tries to guess what software it uses (like server software, CMS, framework, programming language).

DRG CMS: Plugin for writing documentation manuals

Turn your rails application into a Content Managing Site (CMS)

Para CMS I18n admin module for models

Adds browser-native loading="lazy" attribute to images and iframes rendered by Camaleon CMS.

Customize auto-generated sitemap in Camaleon CMS. Eliminate duplicate content and list pages.

Content management engine for Twice Baked

Before/after image slider for spina CMS

OAuth component for Biovision CMS.

Aimbulance CMS

Provides a Backend for CMOR CMS

CMS base module for ruby on rails.

A cms system to create basic pages such as about us, privacy policies, user guides and blogs

A really straightforward open source Ruby on Rails blog engine designed for integration with Refinery CMS.

Kontent Jekyll is utilizing Kentico Kontent, headless CMS, as a content repository and integrates it with Jekyll static site generator. You can generate posts, pages, collections and data items.

*UNDER CONSTRUCTION* A highly customizable CMS and Web App Framework for Rails

iAtelier, a simple, yet powerful CMS engine for Hanami

Description of BlueberryCMS.