There's Ping Identity [1] and Firebase Auth [2], though Firebase is probably not as feature rich as Auth0 [1] https://www.pingidentity.com/ https://www.pingide

There's Ping Identity [1] and Firebase Auth [2], though Firebase is probably not as feature rich as Auth0 [1] https://www.pingidentity.com/ https://www.pingidentity.com/ [2] https://firebase.google.com/docs/auth https://firebase.google.com/docs/auth