OTRS is the leading open-source service innovation suite and includes Help Desk, an ITIL-compatible IT service management (ITSM) solution, an iPhone App and an underlying technology platform. It provides web interface to administer and manage the tickets. Email notifications will be sent out for new tickets and follow-ups. 
 
 Output of reports could be saved as PDF format. It has support for multiple databases. Full text search is provided to search the tickets. LDAP authentication support is available. There are lot more features available with this product. It has more than 80,000 installations around the world. OTRS Group offers global consulting, customization and support services.

OTRS is the leading open-source service innovation suite and includes Help Desk, an ITIL-compatible IT service management (ITSM) solution, an iPhone App and an underlying technology platform. It provides web interface to administer and manage the tickets. Email notifications will be sent out for new tickets and follow-ups.

OTRS - Helpdesk platform in Perl

vtiger CRM is a complete CRM solution that includes Sales, Customer support, Service, Marketing modules, and ERP modules for Inventory & Projects. Its features include Lead management, Contact Management, Trouble Tickets, Knowledge Base, Campaign Management, Mass Mailing, Vendor Management, Invoices, Order management and lot more. It supports Role based access control, Generates customizable reports, Support for mobile devices. 	 
 Sourceforge location: <A HREF="http://sourceforge.net/projects/vtigercrm/" target="_blank">http://sourceforge.net/projects/vtigercrm/</A>

vtiger CRM is a complete CRM solution that includes Sales, Customer support, Service, Marketing modules, and ERP modules for Inventory & Projects. Its features include Lead management, Contact Management,  Trouble Tickets, Knowledge Base, Campaign Management, Mass Mailing, Vendor Management, Invoices, Order management, Project Management and lot more.

vtiger CRM - Complete CRM solution

A trouble-ticket/help desk solution written by those who are tired of the bloated 'Industry Standard' systems. Designed by along-side many unsatisfied users of available ticketing systems; this is the most user-friendly, advanced ticketing system available. Its feature includes:
 <UL>
	<LI>Integrated with Active Directory</LI>
	<LI>Intuitive Interface</LI>
	<LI>Fully Customizable</LI>
	<LI>No Client installation</LI>
	<LI>Integrated FAQ/Help Section</LI>
	<LI>Light Weight - Entire program is under 13mb - including images.</LI>
	<LI>Email integration</LI>
 </UL>

A trouble-ticket/help desk solution written by those who are tired of the bloated 'Industry Standard' systems. Designed by along-side many unsatisfied users of available ticketing systems; this is the most user-friendly, advanced ticketing system available.

SlickTicket

Clockingit / Jobsworth can be used for helpdesk support ticketing, customer liasion, resource management and has a range of CRM type functionality. It helps to Plan your projects, see your schedule, know if you’re slipping behind and why. Time Tracking and extensive reports help you show your clients exactly what you’ve done and for how long. 
 It supports flexible reporting, gantt chart & scheduling, accounting/billing system integration and lot more.
 Source repository: <A HREF="https://github.com/ari/jobsworth" target="_blank">https://github.com/ari/jobsworth</A>

Clockingit / Jobsworth can be used for helpdesk support ticketing, customer liasion, resource management and has a range of CRM type functionality. It helps to Plan your projects, see your schedule, know if you’re slipping behind and why. Time Tracking and extensive reports help you show your clients exactly what you’ve done and for how long. 
  It supports flexible reporting, gantt chart & scheduling, accounting/billing system integration and lot more.

Clockingit - Project Management, Collaboration and Time Tracking in Ruby

FreeScout is the super lightweight free open source help desk and shared inbox written in PHP (Laravel framework). It is a self hosted clone of HelpScout. 
 
Features: 
<ul>
<li>No limitations on the number of users, tickets, etc.</li>
<li>100% Mobile-friendly.</li>
<li>Multilingual (English, French, Japanese, Italian, Polish, Portuguese, Russian, Dutch, German, Spanish, Swedish).</li>
<li>Seamless email integration.</li>
<li>Web installer &amp; updater.</li>
<li>Starred conversations.</li>
<li>Forwarding conversations.</li>
<li>Merging conversations.</li>
<li>Moving conversations between mailboxes.</li>
<li>Phone conversations.</li>
<li>Sending new conversations to multiple recipients at once.</li>
<li>Push notifications.</li>
<li>Following a conversation.</li>
<li>Auto reply.</li>
<li>Notes.</li>
<li>Pasting screenshots from the clipboard into the reply area.</li>
<li>Configuring notifications on a per user basis.</li>
<li>Open tracking.</li>
<li>Editing threads.</li>
<li>Search.</li>
</ul>

FreeScout is the super lightweight free open source help desk and shared inbox written in PHP (Laravel framework). It is a self hosted clone of HelpScout. 


FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative) 

Sinergia is a ASP.NET Workflow Foundation and Windows Communication Foundation based free help desk solution, developed in CSharp. It solves all the Workflow and WCF plumbing implementing one help desk scenario, providing tools to customize it to fit your needs. It provides Help Desk Ticket Management, Claim Management and Order tracking solution. Look and feel, data structures, and business processes are customizable.

Sinergia is a ASP.NET Workflow Foundation and Windows Communication Foundation based free help desk solution, developed in CSharp. It solves all the Workflow and WCF plumbing implementing one help desk scenario, providing tools to customize it to fit your needs. It provides Help Desk Ticket Management, Claim Management and Order tracking solution.

Sinergia - free help desk framework in CSharp

Eventum is a user-friendly and flexible issue tracking system that can be used by a support department to track incoming technical support requests, or by a software development team to quickly organize tasks and bugs. 

Eventum - issue tracking system

It does everything from bug tracking and customer support to project management and to-do lists. It is light weight and web based as it is written in CGI. It has support for Ticket monitoring, Custom fields, Inventory Tracking, Custom fields, Email alerts, File attachments etc. 

 It has reporting and search functionality. It does have backup and restore functionality to migrate the data. 

 Demo: <A HREF="http://www.troubleticketexpress.com/trouble-ticket-demo.html" target="_blank">http://www.troubleticketexpress.com/trouble-ticket-demo.html</A>

It does everything from bug tracking and customer support to project management and to-do lists. It is light weight and web based as it is written in CGI. It has support for Ticket monitoring, Custom fields, Inventory Tracking, Custom fields, Email alerts, File attachments etc.

Trouble ticket express - Help desk software in Perl and CGI

Request Tracker (RT) is an enterprise-grade issue tracking system which thousands of organizations use for bug tracking, help desk ticketing, customer service, workflow processes, change management etc. This product is very stable and been around for over 10 years. 

 It has loads of features like Dashboard support, Seamless PGP support for mails, Richtext editing, Time tracking etc. It has support of more than 15 languages. RT provides a REST API and even a command-line client to talk to RT from other programs and integrate with other systems.

Request Tracker is an enterprise-grade issue tracking system which thousands of organizations use for bug tracking, help desk ticketing, customer service, workflow processes, change management etc. This product is very stable and been around for over 10 years.

Request Tracker - issue tracking system in CGI and Perl

qdPM is a web-based project management tool suitable for a small team working on multiple projects. It is fully configurable. You can easy manage Projects, Tasks and People. Customers interact using a Ticket System that is integrated into Task management. Its feature include Gantt charts, Custom reporting, Muti lingual etc.

qdPM - Web-Based Project Management Software in PHP

A modern, open-source and multi-lingual helpdesk, including email tickets, knowledgebase and forums. All your customer communications in one place, accessible from anywhere. Its features include multi-lingual knowledgebase, community discussions and private tickets integrated with email and lot more. 

Helpy - Modern Mobile-First Helpdesk Application Built in Ruby

eTicket is a 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 help desk solution for any website. It uses Perl gateway, PHP back end, and MySQL database. It has support to add file attachments.

eTicket - PHP based electronic support ticket system

GLPI is the Information Resource-Manager with an additional Administration- Interface. You can use it to build up a database with an inventory for your company (computer, software, printers...). It has enhanced functions to make the daily life for the administrators easier, like a job-tracking-system with mail-notification and methods to build a database with basic information about your network-topology.

GLPI - Asset Management Software

MyIT CRM is designed for the needs of the Service and Repairs Business Industry. MyITCRM provides your business the tools to maintain and track your customers information and work orders, payments made, invoicing, employees and jobs. Whilst MyIT CRM was originally designed for the Computer Repairs Industry, it can easily be used for any type of repairs related business

MyIT CRM - Best Open Source Service and Repairs CRM program available

UVdesk Open Source Helpdesk includes all the standard features to streamline overall support operations and delivering flawless customer support. Get all the queries generated as Tickets, hold, manage and route the inquiries using smart tools to distribute work among team for delivering instant and better customer support experience.
 
 It supports pre-set workflow based on events and conditions to automate actions also helps to escape from executing manual steps in every fixed interval of time.

UVdesk Open Source Helpdesk includes all the standard features to streamline overall support operations and delivering flawless customer support. Get all the queries generated as Tickets,  hold, manage and route the inquiries using smart tools to distribute work among team for delivering instant and better customer support experience.

UVdesk - An Enterprise Level Helpdesk for Every Business

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