WP-Client Client Portal Management & Invoicing Plugin that gives you the ultimate in flexibility to integrate into your current site.
Extend your WordPress installation with BPMContext Intranet Solutions. This plugin adds a login from WordPress to BPMContext.
The Clinked Client Portal plugin is a great addition to the popular Clinked application - a branded, feature rich client portal.
Allows people to securely send you files with an encrypted upload form on your WordPress site.