Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
JumpCloud - Cloud-based directory services. Alternative to Microsoft Active Directory.
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication
Microsoft Azure Active Directory - Azure Active Directory is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups and help secure access to applications including Microsoft online services like Office 365 …
OmniAuth - OmniAuth is a flexible authentication system utilizing Rack middleware.
OneLogin - On-demand SSO, directory integration, user provisioning and more