Web2py (Python) provides a lot of that functionality so you can dive right in on your app. It includes all of the user account stuff but not the payment processing. It also provides a complete admin function. The only caveat, if you care about such things, is that many Pythonistas don't like some of the non-standard approaches Web2py takes. But I have found it extremely easy to use to quickly create apps.
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Web2py (Python) provides a lot of that functionality so you can dive right in on your app. It includes all of the user account stuff but not the payment processing. It also provides a complete admin function. The only caveat, if you care about such things, is that many Pythonistas don't like some of the non-standard approaches Web2py takes. But I have found it extremely easy to use to quickly create apps.