A simple command line utility to switch between different git authors.
Perhaps you do some pair programming? Then use gas to easily switch from your regular user to the pair one.
$ gas use pair-user $ git commit -a -m "Add feature" $ gas use regular-user
Gas is extendable using the same method as git itself. If you write an application according to the naming convention you can use it as a gas command.
I have an example implementation called gas-stats.