Cotter - One-click phone number login and checkout
Superplate - The frontend boilerplate with superpowers
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
Webpacker - Use Webpack to manage app-like JavaScript modules in Rails - rails/webpacker
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
PrimeReact - JavaScript Framework Components