Also take a look at BackendPro
Ultimately you will probably end up writing something custom, but there's nothing wrong with borrowing concepts from DX Auth, Freak Auth, BackendPro, etc.
My experiences with the packaged apps is they are specific to certain structures and I have had problems integrating them into my own applications without requiring hacks, then if the pre-package has an update, I have to migrate them in.
I also use Smarty and ADOdb in my CI code, so no matter what I would always end up making major code changes.
