Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
CAS - Apereo CAS - Enterprise Single Sign On for the Web
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
AdiInviter Pro - The ultimate contacts importer and tell-a-friend system for your website.
LoginRadius - Loginradius is a cloud-based customer identity and access management platform. LoginRadius empowers businesses to deliver a delightful customer experience without compromising security.
Okta - Enterprise-grade identity management for all your apps, users & devices