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

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) 

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

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

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

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.

OSTicket - support ticket solution

OpenSupports is a Support System. It is completely free and open. You can create staff members who will help you to answers as tickets. Also, you can have an articles library for your users. Users can send support tickets and they will be answer by your staff members. This script can be applied to any website which supports PHP and MySQL. A script totally recommended,OpenSupports can be the solution for many webmasters.

OpenSupports - PHP based Support System

Faveo Helpdesk provides Businesses with an automated Helpdesk system to manage customer support. Its feature include Customer service management, Incident management, SLA management, Ticketing management, Built in knowledge base and lot more.

Faveo - Helpdesk and Ticketing System

The open source ticket/issue tracker that can track anything. It supports multiple projects and each project could have flexible fields, categories, status and status workflows. Data could be exported as CSV. Each User can customize their own dashboard. Demo: <A HREF="http://demo.elastik.jarofgreen.co.uk/mod.DemoSignUp/" target="_blank">http://demo.elastik.jarofgreen.co.uk/mod.DemoSignUp/</A>

The open source ticket/issue tracker that can track anything. It supports multiple projects and each project could have flexible fields, categories, status and status workflows. Data could be exported as CSV. Each User can customize their own dashboard.

Elastik - issue tracker that can track anything 

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