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IssueBurner provides issue tracking system integrated help desk software. Free hosted web based issue tracker and help desk for customer support applications.
Issue tracking system designed for professional teams
BUGtrack - web-based bug tracking and project management
Flyspray, a Bug Tracking System written in PHP.
Open source, multi-platform system for issue tracking and team collaboration. The server requires PHP and MySQL, PostgreSQL, Firebird or SQL Server. The client is a native desktop application for both Windows and Linux.