I found a good issue tracking software, what I like in this tool is its ability to create custom workflows, custom fields and assign permissions to it. You can see complete history, get email notifications, and attach files to issues. You have also a good search and a dashboard with summery of all projects.

I tried it and found it very useful, we tried it to track bugs, tasks, and even resumes. Download and try it from http://jtrac.info/