Open source support ticket system simple, free, lightweight, open source, and easy to setup and use.

Trakdesk is a fully customizable customer support platform with all the bells and whistles you would need to provide exceptional customer support.

Ticket Tailor lets you sell tickets online.

Kayako is a customer service software.

Brimir is an Open source ticket manager.

Jitbit Helpdesk is a web-based help desk software it tracks support tickets, fully integrates with mailbox.

Web Help Desk is a powerful and affordable ticketing and IT asset management software solution.

LiveChat is an online customer service software with live support, help desk software, and web analytics capabilities.

PHPBack is an open source feedback system.