WP-Client Web Portal WordPress Plugin :: Secure Client Portals & Online Invoicing
http://WP-Client.com :: Easily used by “techy” and “not-so-techy” Administrators :: One plugin configures multiple areas of your WordPress installation and allows the site Administrator to easily create new Client Areas, Client Management Portals, Client Estimates & Invoices, Client File Upload Areas, or Private Staff Pages on the site by entering just a few data fields and clicking submit. Additionally, clients can upload/download secure files.