A
aDefHelpDesk (Online Demo)
A free open source ASP.NET help desk which also includes a DotNetNuke module.
Asset Tracker
Create multiple asset databases containing any information you wish to keep track of. Some examples: put all your IT infrastructure into the database, or if you are a building manager, put all your facilities equipment in the database. Can also integrate with other systems via plugins.
Associativy
A base platform for building associative knowledge bases. Not a complete product, but a foundation to build your own.
Astres
A free PHP based help desk tool, translations in English and French.
B
Bartley Helpdesk
a light weight helpdesk for small to medium size IT departments, includes inventory management.
BATTS
Open source help desk software, designed for use from a Linux/Unix command line. Includes a full featured email interface for customers.
Big Help
A help desk portal built with Ruby on Rails.
BugTracker.NET (Online Demo)
BugTracker.NET is an open source, web based bug or issue tracker written using ASP.NET, C#, and Microsoft SQL Server/MSDE. Includes a screen capture utility that allows you to capture a screenshot, annotate it, and post it, with just a few clicks.
Bugzilla (Online Demo)
A Perl based software bug tracking system which can also be used for help desk support. Used by the Mozilla Foundation, creators of FireFox.
D
DITrack
Software bug and ticket system designed to use Subversion as it's backend database. Currently there is only a command line interface.
Double Choco Latte (Online Demo)
A GNU Enterprise package that handles both call tracking and project management. It can be displayed inside of a phpGroupWare installation or be used stand-alone.
E
Elastik (Online Demo)
free PHP based help desk ticket software with fully definable schema for fields/workflow
Eventum
An open source help desk software package from the creators of the MySQL database. PHP based and of course uses MySQL for it's database.
G
Google Apps Help Desk Workflow
A simple script for giving your Google Apps account a help desk workflow.
H
Help Desk Lite
Very simple help desk software package for basic issue tracking. It provides two major functions, service ticket tracking and operator assignment.
Helpy
A modern Rails based, mobile first, ticket system with email support.
I
Information Resource Manager
IRM is a free PHP based help desk and asset tracker designed for IT departments.
Information Resource Manager - GLPI Edition
This is the same system as above (IRM), but with some additional enhancements.
IssueTrackerProduct
Zope issue tracker which also handles software bugs. The primary focus is on email communication and request tracking and management.
iTop
A PHP based, ITIL compatible service desk solution
itracker
Java based open source help desk application with an emphasis on modularity. It's also provides i18n support.
J
jHelpdesk
A Java/JSP based open source corporate help desk system.
JTrac
A Java based open source issue tracking system.
Jutda Helpdesk
A Django-powered ticket tracking system for small enterprise.
L
Liberum Help Desk
Web based help desk software package written in ASP and VBScript. Microsoft SQL Server or Access is required. Automatic case routing, email updates, and reporting.
M
Mantis (Online Demo)
A PHP software bug tracking and issue tracking system.
Mr.Wolfe
An issue tracker written in Django
O
One or Zero (Online Demo)
Open source help desk software package optimized for task oriented help desks.
OpenPsa
A full project system where the help desk component is just one aspect. Automatically integrates with Midgard CMS.
OpenSupports
A free PHP support ticket system with multi-language support and a plugin API.
OS Ticket
OS Ticket is a lightweight ticking system designed to be easy to setup and use. It's written mostly in PHP.
OTRS
A trouble ticket system to track telephone calls and e-mails. Designed to allow your support, sales, pre-sales, billing, internal IT, and helpdesk to operate in one system. OTRS is open sourced under the A-GPL and is written in Perl.
P
phpBugTracker
A web-based software bug tracker. The design focuses on separating the presentation, application, and database layers making customization easier.
R
Redmine
Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.
Request Tracker
RT is an open source ticket tracking tool. It has a web based help desk portal as well as support for creating tickets via email.
Roundup
A simple issue tracking system with command line, web and email interfaces. Also includes many other modules such as todo lists and sales lead tracking.
S
Savane
Savane is a Web-based Libre Software hosting system. It includes issue tracking, project member management by roles and individual account maintenance. The issue tracking handles bugs, tasks, support, news and documentation management.
SimpleDesk
A help desk plugin for the Simple Machines Forum system.
Sinergia
Sinergia is a open source framework for creating customized help desk applications written in C# .NET 3.0. It provides a base
on which you can develop your own web based help desk solution.
SiT! Support Incident Tracker
SLA aware support incident tracking system, PHP/MySQL.
ASP based ticket system with support for SQL Server and Active Directory.
Subissue
Uses the Subversion version control system to store issues within your software code repository. Uses the subversion client, but a web based interface is in progress.
SugarCRM Open Source
The open source version of it's commercial counterpart. Mostly a CRM system, but it can also handle light help desk duties.
T
Trac
Minimalistic web based project management and bug tracking tool. Trac also includes wiki functionality. Written in Python.
Trouble Ticket Express (Online Demo)
Web based CGI help desk system. Both MySQL and Microsoft SQL Server supported.
Z
ZenTrack
Zentrack is a help desk, bug tracking, and project management system.
ZwikiTracker
Every ticket in this system is a wiki page. Must integrate with a Zwiki to function.