Liveblocks - Build amazing real‑time collaborative products
Cotter - One-click phone number login and checkout
Seedform - Onboard your customers faster than ever before
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.
Rocketlane - A collaborative customer onboarding platform
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.