InSync is a Google Drive client for Linux PCs. Currently its in beta stage but works quite well. InSync previously supported integration with Unity desktop via Ubuntu app indicator, but with this release, it is tightly integrated with Gnome shell and other desktops like KDE and Cinnamon too.
InSync makes managing your Google Drive a breeze. Its the Google Drive for power and business users. Some of the unique features InSync supports are multiple Google accounts, offline Google docs editing, right click share, recent changes notifications, non-admin windows install, external hard drive support etc which are currently not present in official Google Drive client.
You can download this release from here.