jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.
Gitscout - A beautiful Github Issues experience for macOS
Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...
Shrink for Github - A macOS app for your Github issues
Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.
VarCI - The missing assistant For GitHub issues