GitKraken is a Git GUI client for Windows, Mac and Linux. It helps developers become more productive and efficient with Git. It's free for non-commercial use.
Fork is a fast and nicely designed git client for Mac and Windows.
GitFinder is a git client for Mac with Finder integration. It shows a file's git status with icon badges and executes git operations, all from Finder. GitFinder can also operate like a full-featured git client, with rich repository browser showing local and remote branches, tags, submodules, diffs, history, blames and conflict resolutions.