jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.
NICE inContact - Get the DMG Consulting report reprint on cloud contact centers.
16bugs - 16bugs is an all-in-one bug tracking software that makes it easier for you to manage all sorts of bugs in performance with the simple interface; ultimately, you will be more productive for sure.
Five9 - Five9 provides cloud-based call center software for sales, marketing and support.
Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.
Genesys PureConnect - The Genesys PureConnect platform is an all-in-one customer experience solution that’s easy to use, flexible and customizable to your business needs.