Commit Together by Github - Now add co-authors to your commits
Git2Go - The Git client for iPhone and iPad you always wanted
GitHub Marketplace - Tools to build on and improve your workflow
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.