Crafty Syntax Live Help,
Help Center Live,
osTicket,
PHP Support Tickets,
Support Logic Helpdesk,
Support Services Manager
HelpCenterLive 
Help Center Live is an extremely powerful all-in-one help center including Live Help, Support Tickets and FAQ.
SupportLogic 
The Support Logic Helpdesk is a script to provide an organized support platform for you and your clients.
vtiger 
vtiger CRM is an Open Source CRM software mainly for small and medium businesses.
SugarCRM 
Sugar Open Source enables sales, marketing, and support organizations to manage their customer interactions more efficiently and profitably and is intended for both large and small companies worldwide. Platform agnostic, Sugar Open Source is the least complex, most portable, and most cost-efficient customer relationship management (CRM) solution
CraftySyntaxLiveHelp
A live Help support chat system that allows the operators of the websites to monitor their visitors as they are browsing the site and proactively open a chat session with the visitor.
osTicket 
osTicket can manage emails from an perl gateway via aliases, pop3 with crontab login, or manual pop3 login when admin is accessed.
phpSupportTickets 
Manage customer queries with this one stop solution for online customer relations.
If you don't see what you need ... ask us.