Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
SourceTree - Mac and Windows client for Mercurial and Git.
CodeHub - CodeHub is the most complete, unofficial, client for GitHub on the iOS platform.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.