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Bug Tracking

Listings
Bug tracking system with email notification, file attachment, tracking history, bilingual pages, 128-bit encryption connection and advance customization.
http://www.bug-track.com/
Scrum software for project management. Agile software that is perfect for bug, issue, and defect tracking. Professional hosted (cloud & saaS) or Installed bug tracking software.
http://www.axosoft.com/
Bugzilla is server software designed to help you manage software development.
http://www.bugzilla.org/
Get issues and bugs into one place. Quit using email and spreadsheets. Try DoneDone the simple issue tracker. Nothing to install, get started in minutes.
http://www.getdonedone.com/
MantisBT is a popular free web-based bug tracking system. It is written in PHP works with MySQL, MS SQL, and PostgreSQL databases. MantisBT has been installed on Windows, Linux, Mac OS, OS/2, and others.
http://www.mantisbt.org/