itracker is a true open source issue tracking system. itracker is built using Java enterprise technology. itracker is a professional, easy to use, open, easy to integrate, fast, modular, customizable and scalable solution for all kinds of projects.
Endeavour Agile ALM is an Open Source solution to manage the creation of large-scale enterprise systems in an iterative and incremental agile software development process.
Free web-based bug tracking system written on PHP. Some of the main features are: fully custom templates, advanced filters, LDAP support, email notifications, subscriptions, reminders, flexible permissions management, graphical project metrics, etc.