http://www.cerberusweb.com/
Cerberus Helpdesk is an e-mail response system built to diminish the need for redundant, time-consuming human-interaction with your customers. The system is built to allow your support department to react quickly to inbound customer e-mail inquiries.
Using Cerberus Helpdesk you can streamline the management of your customer support, billing issues, bug tracking, sales leads & more!
Core features:
* Unlimited Tickets
* Unlimited Staff Members (Users)
* Autoresponders per Queue (open + close tickets)
* Compiled C Email Parser
* Email Parsed and Stored as Ticket
* MIME Parsing
* MySQL Database
* Ticket Content Fulltext Index Searching
* Ticket Statistics
* File Attachment Support
Staff Member / Superuser GUI Features
* Forgot Password Feature
* Create/Edit/Remove User
* Create/Edit/Remove Queues
* Add/Edit/Delete Knowledgebase Articles
* Email Notification/Watchers
* Full Permissions System/User Groups
* Ticket View Filters
Knowledgebase
* Unlimited Articles / KB Categories
* Fulltext Index Searching
Customization
* Stylesheet for Simple Customization of Scheme
* Brandable w/ Logo through Configuration
Public-user Tools (Free Add-Ons)
* Public Knowledgebase (customers can browse & search your public articles)
* Public Helpdesk Interface (customers can submit & track tickets)
Screenshots and a live demo are available at:
http://www.cerberusweb.com/