Few Bug tracking system not only tracks the defect, they manages so many other task of project managing process.
List of Bug tracking system tools –
Bugzilla –
Bugzilla is a “Defect Tracking System” or “Bug-Tracking System”. Defect Tracking Systems allow individual or groups of developers to keep track of outstanding bugs in their product effectively.
Who uses – Mozilla, Linux Kernal, GNOME, KDE, Apache Project, Libre office, Open office, Eclipse
Jira –
Jira is a proprietary bug tracking or issue tracking system . Jira is developed by Atlassian and free for use by official non profit organisation, charities and open source projects but not governmental, academic or religious organisations.
For running on premises or hosted application it can be licensed on the basis of number of user. The tool provides the bug tracking and project management functions.
https://www.atlassian.com/software/jira
Redmine –
Redmine is a flexible project management web application. Written using the Ruby on Rails framework, it is cross-platform and cross-database. Redmine is open source and released under the terms of the GNU Public License v2(GPL).
Who uses – Ruby, TYPO3, LIGHTTPD
Request Tracker –
leading enterprise-grade open source issue tracking system. Every day thousands of organizations uses it for bug tracking, help desk ticketing, customer service, workflow processes,change management, and much more.
https://www.bestpractical.com/rt/
Trac –
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.
It provides an interface to subversion and Git (or other version control system ), an integrated Wiki and convenient reporting facilities.
Mantis –
MantisBT is an open source issue tracker that provides a delicate balance between simplicity and power. Users are able to get started in minutes and start managing their projects while collaborating with their teammates and clients effectively.