Good News, Everyone!
In the last months I published some plugins for RailsAdmin, a Rails engine that provides an easy-to-use interface for managing your data.
RailsAdmin Extended Fields
To add more options to fields (css classes from models, nested sortable tabs, nested components): https://github.com/blocknotes/rails_admin_extended_fields
RailsAdmin Live Edit
To edit site contents from the frontend: https://github.com/blocknotes/rails_admin_live_edit
An alternative dashboard: https://github.com/blocknotes/rails_admin_mydash
A Material Design theme: https://github.com/blocknotes/rails_admin_material