jQuery - The Write Less, Do More, JavaScript Library.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
React Native - A framework for building native apps with React
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication
Babel - Babel is a compiler for writing next generation JavaScript.
OmniAuth - OmniAuth is a flexible authentication system utilizing Rack middleware.