ShinyCMS is an open-source CMS built in Ruby on Rails, with support for themes, plugins, and cloud hosting. (There is also a Perl version: www.github.com/denny/ShinyCMS)
Blog websites feature posts written by one or more authors, organized by categories and tags, with a section for comments and archives sorted by date or topic. Additional features may include search bar, social media sharing, subscription or RSS feed, about and contact pages, and visual content.
A fullstack boilerplate provides a starter application that includes both frontend and backend. It should include database, auth, payments, user roles and other backend services to build a fully featured saas or webapps.