Gitscout is described as 'Browse, organize and manage your GitHub Issues. "Save" any issue in one click and stay focus. Search, filter, and sort your issues instantly. Stay in the loop, and get notified of any change' and is an app in the development category. There are 2 alternatives to Gitscout for Mac. The best Gitscout alternative is Flawless.
Flawless is a Mac desktop app to facilitate iOS development by helping you compare between mockups and implemented designs in real time. The tool includes overlay and split comparison modes with built-in iOS simulator to help ensure designs are as expected.
BugHub provides a native Mac interface to GitHub's issue tracker. BugHub is a full featured client that lets you create, comment, close, and manage your issues.
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Flawless is a design tool that allows iOS developers to seamlessly blend between Flawless UI and Xcode iOS project's dashboard.
Flawless has nothing to do with tracking GitHub issues.