TrackDuck - Visual feedback for web design and development.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
zipBoard - ZipBoard is a web-based visual bug tracking & issue tracking tool that helps developers, testers and project managers collaborate during website and elearning development.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
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.