The software used to track all the mozilla projects, including Firefox. it can be downloaded and installed for your projects. Uses Perl language, MySQL, PostGRES and a CGI capable web server.
Opensource  
Rank: 1136
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Mantis is a free popular web-based bugtracking system (feature list). It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. Mantis has been installed on Windows, Linux, Mac OS, OS/2, and others. Almost any web browser should be able to function as a client. It is released under the terms of the GNU General Public License (GPL).
Opensource  
Rank: 649 1
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RT is an enterprise-grade ticketing system which enables a group of people to intelligently and efficiently manage tasks, issues, and requests submitted by a community of users.
Written in object-oriented Perl, RT is a high-level, portable, platform independent system that eases collaboration within organizations and makes it easy for them to take care of their customers.
Opensource  
Rank: 1035
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FogBugz is a complete project management system for software teams. Designed by Joel Spolsky of Joel on Software fame, FogBugz helps you make better software by tracking, prioritizing, and coordinating the thousands of small tasks a development team has to do. FogBugz is web based, so everyone on the team always sees the whole picture. Feature requests, customer email, bugs, even high level design discussions are instantly searchable and trackable.

Licences around 130$ user or less. 

Pay  
Rank: 1065
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Trac is an enhanced wiki and issue tracking system for software development projects. Trac uses a minimalistic approach to web-based software project management. Our mission is to help developers write great software while staying out of the way. Trac should impose as little as possible on a team's established development process and policies.

Uses Python language with MySQL,  PostgreSQL or SQLite

Opensource  
Rank: 1230
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Bringing you a powerful Bug tracking solution and a top notch community to go along with it. Search for bugs, get solutions, consult. Enjoy the power of a community tighted by bugs.
Free  bug, tracking
Rank: 1135
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A online bugtracking with a lot of good feature like tasks, multiple projects, svn integration, etc...
Pay  bug, tracking
Rank: 265
No comments Source http://railsontherun.com..

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A trac type web system.
Opensource  bug, tracking
Rank: 1220
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Our flagship support product SupportSuite™ is a robust and flexible turn-key solution, allowing you to implement effective support channels, e-mail management and manage self-help resources. SupportSuite™ does this by combining ticketed support (web and e-mail based), live chat and an intuitive customer interface.

Pay Business  bug, tracking
Rank: 1982
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