After keeping this template for myself and creating numerous products based upon it (including www.startupcosts.co). I decided to productise this template. It lets you choose between various default Rails options, but also adds a modern front end tooling (Webpack, PostCss, Tailwind), authentication with Devise (including views), options for various error monitoring and analytics.
Basically all the mundane things you have to build for your SaaS app, but are not your product's core.
There's also a deal through PH today. Buy today for $29 and get 12 months of free updates! Check it out here.