Landing : Athabascau University

FreeIPA

https://www.freeipa.org/page/Main_Page

This is a killer tool and freedom breaker for any application looking for SSO. Not only it can handle authentication on its own but it can talk to Microsoft Active Directory for those cases where enterprise policy requires so. Top it up with Ipsilon and you've got yourself an SSO piece of cake that you can eat anywhere in the cloud.