Hey,
I've worked with Gluu as an IDP server, configured it for both Oauth and SAML, let me know exactly what SSO connection you want to setup and what app you want to Authenticate with your Gluu Server and I could provide some insight into this connection, I can setup a gluu server in no time on a Google Cloud Or Azure VM and setup some test flows, if you would like to discuss this matter further, let me know and I will gladly chime in.
Best Regards!