Currently, Web TimeSheet and Web Schedule products support SAML version 1.1. Web Time Off does not support SAML. 

For the implementation of SAML with Web TimeSheet or Web Schedule, your organization can use any SAML IDP server that is compliant with SAML 1.1. In other words, implementation of SAML is not restricted to an IIS server working in a Windows AD environment. For example, even if your organization is running a PHP IDP server under Apache, you can implement SAML as long as the server is SAML 1.1 compliant.

Related Items:

What is SAML and how to set it up?