In Devise you own controllers, models and views. With Booth you don't own the models (much like ActiveStorage). The Controllers you do own, but the implementation is pretty much just calling Booth helpers. The views you own completely, just as in Devise.

Simple cart-checkout for your store

Rails Engine for collecting subscribers to a mailing list

EasyAuth-Password

Easy to install opinion box for Rails application.

User component for Rails applications.

Woodlock is an authentication and user management engine.