Bug-A-Boo is a bug reporting and tracking system that runs on any Web server that supports CGI. It helps you to keep an eye on bugs reported to you by users of your software products. It can handle any number of projects, users, and bug classifications, and is really flexible in their setup. It features fast fulltext search, query storage, themes, and bug watches. It uses the tdbengine as a database backend.
Copper is a Web-based project management software tool designed to help creative teams manage clients, projects, tasks, files, budgets, and events. It has an HTML/AJAX front end. It is available with full source for a licence fee or as a SAAS hosted service (compatible with iPhone, but available via PC/Mac/Linux and a Web browser).
TUTOS (The Ultimate Team Organization Software) is a groupware, ERP (Enterprise Resource Planing), CRM (Customer Relationship Management), and PLM (Project Lifecycle Management) suite that helps small to medium teams manage various things in one place. Its features include personal and group calendars, an address book, product and project management, bug tracking, installation management, test management, scrum management, a task list, notes, files, mailboxes, and useful links between all of the above.