ALL IN ONE Web Based Help Desk Software by Vision Helpdesk, supports Multi Company and Multi Channels like E-MAIL, WEB-FORMS, TWITTER, FACEBOOK, CALLS and CHATS
Another alternative to Kayako is Support Tracker.Net, a 100% Web based help desk system that improves support services by simplifying ticket creation, smart ticket routing, automating workflow and providing functions for tracking ticket status and help desk performance. A free online demo is available.