openDesktop.org - The website openDesktop.
Gitscout - A beautiful Github Issues experience for macOS
SourceForge - The Complete Open-Source and Business Software Platform.
Shrink for Github - A macOS app for your Github issues
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.
GitHub Reader - A quick way to browse GitHub issues and pull requests.