Git Extensions is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is SmartGit. It's not free, so if you're looking for a free alternative, you could try GitKraken or GitAhead. If that doesn't suit you, our users have ranked more than 25 alternatives to Git Extensions and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Git Extensions are Sourcetree (Free), GitHub Desktop (Free, Open Source), Fork (Paid) and gitg (Free, Open Source).
SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS X and Linux. SmartGit is intended for developers who prefer a graphical user interface over a command line client, to be even more productive with Git.
Tower is a native desktop Git client for both macOS and Windows. The app gives developers, designers, and non-technical people easy access to the full power of Git with features such as Pull Requests, Interactive Rebase, Image Diffing, Quick Actions, Undo and much more.
Sublime Merge is a fast and intuitive git client built on the same performant platform as Sublime Text. FEATURES - integrated three-way merge tool, - side-by-side diffs - powerful search - syntax highlighting
Sublime Merge vs Git Extensions opinions
pros, cons and recent comments
This is a merge tool. Git Extensions is a Git GUI. You could use these tools side-by-side; as far as I know, they don't even have any overlap in usage.