Gigya is a CIAM that provides registration as a service. It can be used for setting up SSO or federated SSO between different sites. It also provides the solution for consent and preference management.

Screens and automated emails to customers can be highly customized, and it also provides drag and drop features to enhance the look and feel of different screens like registration or login.

It can also be configured to support different protocols like SAML and OIDC. 

SAP CDC is very easy to use and the best part about this tool is its documentation.