Subscription and Membership Scripts that leverage CI?

[eluser]Unknown[/eluser]
I'm looking to add a secure member's area on my website and then add membership and subscriptions capabilities, all with commerce capability etc. I researched a bit and found https://www.ppsd2.com/index.php, this seems like a pretty robust platform but i don't like that i cant develop against it. I have additional needs that would violate their t&c's. Does anyone know of any scripts or applications that are either open or that can be purchased that do similar things so i don't have to code from scratch?