Mac OS X comes with Python 2.7 (for now) but not the installation programs supported by Git and git-review. 'In-client merge resolution' is the primary reason people pick SmartGit over the competition.
Open Terminal and change to a directory you're comfortable downloading test Git packages to (such as Downloads) Download and install the OS X Installer for Git (for OS X 10.8 and earlier only, OS X 10.9 ships with Git pre-installed) Contribute to the open source community, manage your Git repositories, review code like a pro, track bugs and features, power your CI/CD and DevOps workflows, and secure code before you commit it.