BugList is a bug/feature tracking system focusing on being easy to set up and use. It is written entirely in PHP, and only relies on PHP and MySQL for setup. Its feature set matches the requirements of a small to middle sized project. Apart from the standard categorization features, it is very easy to create customized views of the outstanding bugs. The system supports attachments and makes linking between bugs very easy. The entire system is used and managed using a Web-interface.
Issue-Tracker is a support issue tracking system. The system is written to be user-friendly and is built around a modular API to make it easy to add to if need be. It includes many features that can help customer/technical support organizations resolve issues quickly and easily. These features include things like file uploads, email parsing, unlimited users and groups, email and SMS notifications, group and user reporting, and much more.
The Bluetail Ticket Tracker (BTT) is a system for creating, storing, and keeping track of tickets. A ticket describes an issue of some sort. It can, for example, be a Trouble Report or a ToDo note. BTT also makes it possible to store customer information, which can be coupled to a ticket. BTT comes with a wiki-style knowledge base and an automatic mail store.