CodeHub is the best GitHub client to keep up with the open source world. Check it out, I think you will love it :)
->Trending repositories
->News Feed
->Notifications
->View code with syntax highlighting (choose from 9 different styles)
->Create Issues
->Comment on Issues and Pull requests
->Search repositories, users, code and issues.
->Star, Watch and Fork repositories
->Follow people
CodeHub aims to do all those things that the GitHub Desktop app doesn't do. Our goal is to make an app for UWP which lets you keep up with the open source world on the go.