Sugarcrm-activities-reports is a project mainly written in ..., it's free.
Activities Reports module for SugarCRM
This is a modified version of original SugarCRM Activities Reports published on SugarForge at http://www.sugarforge.org/frs/?group_id=935.
We are giving it away for free (see License Agreement) and without any support. But as we are using it ourselves at http://www.vanilladesk.com, we expect to enhance it and keep it working :-)