WebBTS - WebBTS is a tool created with PHP and MySQL to trace and mantain a bug database from the Web. With WebBTS you can manage bugs from a centralized place. WebBTS has suport to notify of operation on bugs via e-mail.
Tracker is a vendor neutral defect tracking tool designed for medium to large scale IT projects. It can also be used as a ticketing system for support helpdesks and to manage both team and individual work queues.