WordPress Client Portal, Invoicing & Project Management Plugin :: WP-Client
Private Client Login Area for your Theme :: Estimates, Invoices, Billing & Galleries > Customer File Sharing w/ Upload...
Memphis Documents Library
A documents library for WordPress.
WP-Filebase Pro | The WordPress Downloads Manager with Cloud support
File Away: A File Management Solution for WordPress
Use File Away to add an upload form to the front-end of WordPress, and let users view, and preview, ...