Commit Together by Github - Now add co-authors to your commits
Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
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.
Source iOS - The best git client and code editor for iOS.
Carbide - A new kind of programming environment