Issue Tracking System was used to find:

Secure Source Code Management in the Cloud. Assembla is the only multi-repository platform in the world offering NextGen SVN, Git and Perforce, all in the Cloud.

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IssueBurner provides issue tracking system integrated help desk software. Free hosted web based issue tracker and help desk for customer support applications.

Issue tracking system designed for professional teams

Some organizations seem to try to use an issue tracking system more like a demerit system. One benefit of a comprehensive issue tracking system is having data

Flyspray, a Bug Tracking System written in PHP.