Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
OneLogin - On-demand SSO, directory integration, user provisioning and more
Spring Security - The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security...
TeamPassword - TeamPassword helps you manage and share access to the apps, services, and tools your team needs to keep projects moving.
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication
WebTitan - WebTitan is an advanced DNS based web content filter and web security layer that blocks malware, ransomware and phishing attempts as well as providing web content control. Cloud and gateway versions available.