((OTRS)) Community Edition (Znuny) is a Ticket Request System (also well known as trouble ticket system) with many features to manage customer telephone calls and e-mails. The system is built to allow your support, sales, pre-sales, billing, internal IT, helpdesk, etc. department to react quickly to inbound inquiries.

Bugzilla is a Web-based general-purpose bugtracker and testing tool originally developed and used by the Mozilla project. One of Bugzilla's major attractions to developers is its lightweight implementation and speed. Many projects use it to track feature requests as well. Bugs can be submitted by anybody, and will be assigned to a particular developer.