Hello. My name is***** will be providing an answer to your question today
Thank you very much for giving us an opportunity to help you. You could look into something like Cake, or CodeIgniter both of which do much of the tedious work for you. The closest frameworks to want you require are Symfony, Yii & CakePHP, they all have a console (command line) tool.But still miss option you looking for. Waiting your feedback http://www.yiiframework.com/extension/yii-user/
Ok thanks for the feedback please look at this... Here is a front -end -user plugin http://get-simple.info/extend/plugin/front-end-user-login/202/ and one for invoices http://codecanyon.net/item/invoiceform-invoicing-made-easy/6517595 please let me know if this is what you looking for.