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magit is probably the best interface to git; although it's emacs only. -- e.g. With magit, stuff like `git commit --fixup <commit>` is very straightforward to do.

Outside of emacs, lazygit is worth checking out if you're constantly on the command line.

Not a GUI, but a nice TUI : https://github.com/jesseduffield/lazygit

Some videos show the workflow here : https://jesseduffield.com/15-Lazygit-Features/

Heavyweight, but Android Studio (IntelliJ would probably also work).

Supports everything I'd want with a great UI except for `git bisect` and a couple of the `gh` commands.

I highly recommend Sublime Merge. It's especially good for those that know git well already.