All kinds of organizations need bug trackers. Whether it's software developers, Web site developers, or just organizations with significant IT needs, bugs must be tracked. (And, you know, fixed.) To that end, there are plenty of bug tracking tools available, but none that are open source and as easy to install and manage as Mantis Bug Tracker. This weekend, get started tracking bugs with Mantis!
Read the full thing at http://www.linux.com/learn/tutorials/451190-weekend-project-manage-bugs-with-mantis
I've been using and modifying Mantis for almost 10 years - damn fine app.