osTicket is a widely-used open source support ticket system. It seamlessly integrates inquiries created via email, phone and web-based forms into a simple easy-to-use multi-user web interface. Manage, organize and archive all your support requests and responses in one place while providing your customers with accountability and responsiveness they deserve.

Web and Email Suppport
Tickets can be created via email, online forms or phone (created by staff). Flexible configuration and mapping.
Auto Response
Automatic reply that is sent out when a new ticket is opened or a message is received. Customizable mail templates.
Canned Replies
Predefined responses for frequently asked questions.
Internal Notes
Add internal notes to tickets for staff
Help Topics
Configurable help topics for web tickets. Route inquiries without exposing internal departments or priorities.
Alerts and Notices
Staff and clients are kept up to date with email alerts. Configurable and flexible settings.
Role-based Access
Control staff’s access level based on groups and departments.
Assign & Transfer Tickets
Assign tickets to a staff and/or department.
No signup Required
No user account or registration required for users (ticket ID/email used for login).
Support History
All support requests and responses are archived.

Price: It’s Free

osTicket Website Link; http://www.osticket.com

A satisfied customer will stay with your web site and bring you new customers therefore a support/ help desk system is a must for membership sites. eTicket Support is free and effective script, we recommend you.

eTicket is a PHP-based electronic support ticket system that can receive tickets via email (pop3/pipe) or a web form. It also offers a ticket manager with many features. An ideal, easy to use and install helpdesk solution for any website.

eTicket offers many features and can be easily skinned to the look and feel of your website.

Web site Address: http://www.eticketsupport.com/

Screenshots of eTicket;