Linux is the reason for Git, so I think that it is the best place to work with Git. I play with Linux now and then, and I usually use the Bash shell for Git.

For ZSH shell lovers, I suggest looking at http://ohmyz.sh/, an interesting open-source project where you can find tons of plugins and themes. When it comes to plugins, there are some that let you enhance your Git experience with this famous alternate console.

At the end, take a look at some Git GUI for Linux by visiting http://git-scm.com/download/gui/linux