The International Space Station gets it supplies from an ever-growing array of unmanned cargo ships, including the Japanese HTV, the European ATV, the Russian Progress, and the commercial Dragon that just rendezvoused with ISS after a brief thruster scare. There are yet more on the way, with the next ship to launch being Orbital Sciences’ Cygnus demonstration mission, now that ATV-4’s flight got bumped due to an avionics glitch.
Who can keep them all straight? Well, this handy chart, courtesy of RIA Novosti, might help. Check it out (click to expand):