Keycloak - Open Source Identity and Access Management for modern Applications and Services.
OneLogin - On-demand SSO, directory integration, user provisioning and more
DbProtect - Trustwave DbProtect is a highly scalable database security platform that helps organizations secure their relational databases and big data stores, both on premises and in the cloud.
Okta - Enterprise-grade identity management for all your apps, users & devices
CAS - Apereo CAS - Enterprise Single Sign On for the Web
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.