Carousel Cloud can be configured to use Shibboleth as a SAML Single Sign On provider!
To add Shibboleth as an identity provider, start by logging into Carousel as an administrator, clicking on your username in the upper-right, and selecting Configure.
Then select Users.
Select SSO Identity Providers, then select New.
Here you will find your Carousel SAML Service Provider Information for Shibboleth.
Then, name the integration, enter in all of your identity provider information from Shibboleth instance and optionally upload your organizations logo. This will display on the Carousel Cloud Login Screen. Then press save.
Selecting the SSO ONLY toggle will configure the system so that only site admins will be able to log in using an email/password.