The World's Most Flexible Test Management System

Zephyr provides end-to-end management of the testing life cycle in the test department including resources, releases and sprints, test cases, scheduling, test execution, defects, documents, collaboration and all aspects of reporting and metrics in real-time. It allows users to leverage their existing tool investments by providing seamless integration with popular defect tracking systems like JIRA and Bugzilla and inter operating with commercial, open source or home grown automation tools.

Reference: http://www.getzephyr.com