QuickTicket is a powerful, scalable and fully customizable trouble ticket management system for your web site. It support several databases : MySQL, SQL Server, PostgreSQL, FireBird, SQLite, MS-Access via odbc, Informix or DB2.

eTicket is an electronic (open source) support ticket system based on osTicket, that can receive tickets via email (pop3 or pipe) and a web-based form, as well as manage them using a web interface, with many new features and bug fixes.

A free web-based call center software solution. Manage all aspects of your call center from adding calls and managing users. Uses PHP and MySQL. GPL

Simple Help Desk is a php based free help desk call center system for your web site or internal web page. End users can create a account and submit new trouble tickets, and also view their past trouble tickets. Administrators resolve trouble tickets, special administrators can be assigned to only see particular priorities or categories of help desk calls. The software comes with an easy to use install script making it possible for little computer knowledge to get the software setup.

PHP Zen Help Desk Features, trouble ticket creation, help desk knowledge base search, trouble ticket status checking, sorting by ticket number, category, status and who the ticket was assigned to. This is a great help desk application for anyone wanting to quickly deploy a helpdesk solution in their information technology department.

Facil HelpDesk is an easy to use "issue tracking software" for PHP, based in tickets, enabling users to track and manage their support requests faster. Tickets submission is by web or email(emails => tickets), supports File attachments. Facil HelpDesk was designed for companies with one or more members of staff or for those who want to organise communications. With Facil HelpDesk, you have access to articles, polls of responses, basic reports of usage,email validation,email notifications,etc.

The swDesk Online Help Desk software is an innovative ticket system designed to manage customer requests with greater efficiency and accuracy. An advanced Customer Relationship Management (CRM) application with a wide range of features, swDesk ensures that your company delivers the highest level of customer service and support.