GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
SourceTree - Mac and Windows client for Mercurial and Git.
Frog Git - Frog Git is the community-based lightweight code hosting solution that is written in the Go language.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Kiln - Kiln is a complete source control management system based on Git and Mercurial.
TortoiseGit - TortoiseGit is an easy to use client for the Git distributed revision control system.