Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Okta - Enterprise-grade identity management for all your apps, users & devices
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
SailPoint IdentityIQ - IdentityIQ is an IAM solution that unifies identity management processes across cloud, mobile and on-premises environments.
OneLogin - On-demand SSO, directory integration, user provisioning and more
ForgeRock - ForgeRock creates identity relationship management solutions for the modern Web including public cloud, private cloud, hybrid cloud, and enterprise and mobile environments.