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Flyspray is an uncomplicated, web-based bug tracking system written in PHP for assisting with software development. It was originally conceived when the Psi Jabber client project couldn't find a bugtracker that suited their needs, and has been made available for everyone to use for their own projects.
Completely customizable, CakePHP based project management system for firms, their teams and their clients. A project management system that will suit your needs because it is module based, so it can grow and shrink with your requirements. Version 0.4 beta was released March 23, 2009.
WebIssues is a system for issue tracking and team collaboration. It can be used to store and track issues with various attributes, comments and file attachments. The system is easy to install and use but has many capabilities and is highly customizable.
Online project management and issue tracking with team collaboration, custom fields and forms, JasperReport reporting, user management, multiple access levels, tasks, projects, time tracking, task change history, multiple attachments, Gantt graphs.
Projecturo is a .NET based project management and ticketing tool (issue/task/feature tracking). It makes it very easy to manage your software development projects, tasks and tickets (bug, issues, features). It is developed in C# (.NET 3.5).
BugMS is web based bug monitor system. It features 5 different user levels, widgets, email notifications, individual display profiles for every user, multi language support. Written in Java and powered by ZK framework 5.0
Issue tracking system trying to keep the simplicity of Google Code Issue Tracker while adding more features and being open source.