Drupal SAML 1.1 IDP single sign on support is now supported by SSO Easy, in the EasyConnect SAML product.
This capability is valuable for Drupal customers who want to enable SAML 1.1 based SSO, either within their enterprise, with their business partners, or both, where there is a requirement to act as the Identity Provider, or IDP.
SSO Easy provides additional PHP and Drupal single sign on support, including support for SAML 2.0, and Service Provider, or SP, support.
Additional information can be seen at the SSO Easy web site.