Yii - Open Source PHP Frameworks

Yii is an open source, object-oriented, component-based PHP web application framework.

Trac - Open Source Bug Tracking

Trac is an open source web-based project management and bug tracking system. Trac is written in the Python programming language. 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.

Project Management & Bug Tracking Tool

Open Source project management and bug tracking software

Redmine is an open source, web-based project management and bug-tracking tool. It includes a calendar and Gantt charts to aid visual representation of projects and their deadlines. It handles multiple projects. Redmine provides integrated project management features, issue tracking, and support for various version control systems.

MantisBT - Open Source Bug Tracking

MantisBT is a open source web-based bug tracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. MantisBT has been installed on Windows, Linux, Mac OS, OS/2, and others. Almost any web browser should be able to function as a client. It is released under the terms of the GNU General Public License (GPL).