Bug Tracking and Defect Tracking Resource Site
Comprehensive directory on bug tracking, defect tracking, issue tracking, configuration management, requirements management, SQA links, tools, software, articles, books, forums and much more.
http://www.bug-tracking.info/

Defect Agent
Defect Agent is get-to-the point defect tracking software for software development teams. General features include bug tracking, suggestion tracking, workflow management, project prioritization, detailed audit history for each item, and the ability to maximize communication between all technical staff members.
http://www.defectagent.com

BugMonitor.com
BugMonitor.com is a hosted web application service to monitor, track, and manage bugs, issues, defects, and enhancement requests for software applications. Businesses can manage and track software bugs and ERs. Manage testing.
http://www.bugmonitor.com

Serena ChangeMan
Serena ChangeMan ZMF is the industry’s leading software configuration management tool for mainframes. Protect corporate assets and get more done in less time.
http://www.serena.com/products/zmf/index.html

Sparta Systems, Inc.
Quality Management Software from Sparta Systems is the leading enterprise corrective action software for quality management, compliance management, CAPA, complaint handing, Change Control, and other applications.
http://www.sparta-systems.com

StarTeam
Borland software change management and configuration management solutions designed to meet the needs of all development teams according to size, geographical distribution, and work style.
http://www.borland.com/starteam/

Defect Tracker
Software Planner is an award winning application lifecycle management (ALM) tool that helps Information Technology (IT) departments manage all components of software development including managing customer requirements, project deliverables, test cases, defects, and support tickets.
http://www.pragmaticsw.com/Pragmatic/DefectTracker.asp

Devcycle
Provides an online solution for product and development management. Includes task management, issue and defect tracking, discussion forums and knowledge base.
http://www.devcycle.com

Software-Pointers - Directory of Defect Tracking Tools
Directory of Sites relevant for Software Development / Defect Tracking Tools
http://www.software-pointers.com/en-defecttracking-tools.html

AccuRev
AccuRev is a software configuration management solution. Best practices in managing the software development process, version control, SCM, source code control, agile development, change management, software defect and issue tracking.
http://www.accurev.com/