Bugzero is a Web-based change management and issue tracking system used in a distributed team environment to track software bugs, hardware defects, test cases, or any other issues. It can also be used equally well as a helpdesk customer support, trouble ticketing, or email management system to collect and manage customer feedbacks, incidents, requests, and issues. It is easy to use, but still flexible and adaptive, and can be configured to fit to your organization's unique business process and workflow.
Bugzilla is the leading open-source/free software bug tracking system, with high-profile installations at mozilla.org, GNOME, Red Hat, and NASA, among others. It features a comprehensive set of fields, attachment management, inter-bug dependencies, email notification of changes, a powerful query interface, reporting, and Web, XML, email, and console interfaces. It can be managed entirely using a Web-based UI. The user UI is customizable using templates.
DisTract is a distributed bug tracker. DisTract allows you to manage bugs in a distributed and potentially offline manner through your Web browser on your local machine. The distribution is achieved by making use of a distributed software control system, Monotone. Thus Monotone is used to move files across the network, perform merging operations, and track the development of every bug.
EBsuite.com is a Web-based e-business software suite for small to mid-sized businesses and developers. Its project management module contains integrated bug tracking, file checkin/checkout, patch management, project/task scheduling, a Gantt chart, a calendar/task application, and much more.
JumpBox for OTRS is a virtual appliance for OTRS. OTRS is a ticket request system (also known as a trouble ticket system) with many features to manage customer telephone calls and email messages. The JumpBox for OTRS allows anyone to be up and running with this system on any OS in under a minute. The virtualized nature of a JumpBox makes it trivial to move across OSes and hosting environments. And with features like built-in automated backups, it's the easiest way to deploy and manage OTRS.