Yes! Stormpath is currently configurable as a SAML Service Provider to allow your end-users to log into your Application by authenticating with an external SAML Identity Provider.
This functionality is currently available in the core Stormpath REST API and documentation is available here.
Support for SAML in the Stormpath language SDKs and framework integrations is currently underway. Please contact email@example.com if you have any questions about the current state of our SAML integration or SDK support.
Functionality for allowing your Application to serve as a SAML Identity Provider is not yet available, but is on the roadmap.