Rails Admin
RailsAdmin is a Rails engine that provides an easy-to-use interface
...It integrates with popular authentication and authorization systems (e.g., Devise for login, Pundit/CanCanCan for permissions), and plays nicely with file uploads via Active Storage and common upload gems. Configuration is declarative: you tailor fields, labels, filters, and navigation structure in a single place without forking templates. For many Rails apps, RailsAdmin provides a production-ready back office that saves weeks of bespoke tooling while remaining easy to extend when business rules get more complex.