Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Gitential - Analytics for Git Repositories
SourceTree - Mac and Windows client for Mercurial and Git.
Diff So Fancy - Make Git diffs look good
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.