Hello friends, I am working on implementation a public cloud project. I want use OpenStack for management of my cloud , but I have a big problem about select "Portal" that integrated with OpenStack. I need a portal for my website. This portal should be below features: 1- Have a advanced users store (can be store up to many million users) along with registration, authentication, authorization. 2- Have a profile management that through it customers can be view and modify their information. 3- Integrated with OpenStack with "SSO" and "synchronization tables of member information" ability. I don't know that "synchronization tables of member information" between a portal and OpenStack is reasonable decision, but I want to have a membership management like google. In google you create an account and with that you can access to all services. 4- Integrated with a billing software like WHMCS.