CDR-Stats is a free and open source call detail record analysis and reporting software for Freeswitch, Asterisk and other types of VoIP Switch. It allows you to interrogate CDR to provide reports and statistics via a simple to use powerful web interface.
It is based on the Django Python Framework, Celery, SocketIO, Gevent and MongoDB.
Star2Billing S.L. is the company behind the development of CDR-Stats.