GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
PyUI Builder - A GUI builder for Python GUI frameworks
SourceTree - Mac and Windows client for Mercurial and Git.
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
TortoiseGit - TortoiseGit is an easy to use client for the Git distributed revision control system.