I have done a lot of research on this topic and have not been able to find a whole lot about it. I'm hoping people here can help me out.
I am in the initial stages of planning out a subscription-based site. It will offer free content, paid content and premier paid content. I am looking for a CMS, and preferably an open source CMS, that will support this. I would like it to have some kind of built-in registration system that would allow people to sign up for any of the paid subscriptions.
I have looked at MODx and, while it comes close to doing all I need, it doesn't handle the subscriptions, so I would need to add users manually. There are a few other things it can't support either.
A package like VisionGatePortal seems ideal, but at $100 per month it is a bit steep, especially since it can only be hosted on their servers. Membergate also looks good, but the price is $4000+.