Open source and free under the GNU General Public License (GPL).
Summary, detail, and per user reports.
Automated email report delivery.
Report data available in CSV format.
Untangle Forums: Reports
Untangle Wiki: Reports
The Untangle Server Software logs events to log files. Reports monthly reports based on the information in these log files. Reports stores old reports for 30 days. You can email these reports to other users and view them in your browser. You can view your Report data in either the HTML or PDF formats."