Here is a semi complete feature list for itracker:

System:

• J2EE 1.3 Application
• Utilizes Jakarta Struts
• Platform independent
• Database independent
• Pluggable Authentication

• Ability to create issues
• Ability to edit issues
• Attachment support
• Detailed histories
• Email notifications
• Full issue activity auditing
• Issue searching
• Optional auto-login
• Per project components and versions
• Per project custom fields (String, Integer, Date, Lists)
• User preferences

• Attachment management
• Online real-time customization of statuses, severities and custom fields
• Full i18n support
• Ability to modify translations, and add new languages via an online interface
• Optional self-registration and forgot password features
• Project locking (complete, view only)
• Project level options
• Scheduler with the ability to create new tasks
• User level per project permissions
• User locking

• Customizable reporting system based on JFreeReports and JasperReports
• Severity report
• Issue export to XML
• Ability to add new reports through a web interface

• Web client (Full Featured)
• Eclipse Plugin (View/Create/Update Issues)
• Web Services API (View/Create/Update Issues)
  

Users:

More than 55'000 downloaded itrackers!

Yes, we are on SourceForge.
Yes, because they have a good relationship to the communty.
Yes, dear SourceForge, please add Java support to your web hosting,
and yes dear SourceForge, thanks for the subversion support you gave us! Thanks.