Even if you aren't using AVR processors, the MHV AVR toolchain comes with a bunch of command line tools that are handy (like, say, make)
We pretty much just use this toolchain rather than any other at this point
On the off chance the site is down, here is a mirror (Don't use this download unless the main site is down since there may be a newer version!)
Download, unzip and run the installer
The default settings are best, including the already-clicked Add MHV Tools to Path
You can see during installation that you get a mess load of command line tools installed for you. They aren't the latest versions but they work pretty well!
For example, you now have make (finally!)
and, of course, avr-gcc