For users looking to download and use Mac OS X Mavericks 10.9

Yes

– if you own a Mac Pro 3,1 (2008) or a white MacBook from 2009. Modern browsers like Firefox Legacy or Chromium Legacy keep Mavericks somewhat usable for light web. For virtualization, it’s a lightweight, snappy OS that requires only 2 GB of RAM.

sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction

How to Download Mac OS X Mavericks 10.9 ISO and DMG Image