Drivers for Keetouch hardware can be downloaded below:

Resistive

Windows

Universal windows driver

OS X

OS X universal driver

Linux/X11

No driver required

Surface Acoustic Wave

Windows

Windows Vista and below x86 

Windows 7 and above x86

Windows 7 and above x86_x64

Linux/X11

Linux UPDD*

Infrared

Windows

Windows Vista and below x86 

Windows 7 and above x86

Windows 7 and above x86_x64

Linux/X11

Linux UPDD*

Projective Capacitive

No driver required (Plug and Play)

Works better with opensource driver, use Linux UPDD as the last resort