Request Tracker, an enterprise-grade issue tracking system
Request Tracker is an open-source, enterprise-grade issue and ticket tracking system. It helps organizations manage workflows, customer requests, and internal project tasks efficiently.
Mailer-Project is a free full-featured mail-exchange script (or so-called paid-mailer written in PHP4/5 which lets you easily setup a complete mail-promotion service including email and web templates, ticketsystem for your members, task management and many more.