Source -- http://www.visionhelpdesk.com

Vision Helpdesk is the only web-based helpdesk software that allows you to manage support for multiple companies at one place. With single front-end and each company having its own client portal makes it true satellite helpdesk.

The ALL IN ONE customer support helpdesk allows you to manage various channels like E-MAIL, WEB-FORMS, TWITTER, FACEBOOK, CALLS everything under single roof.