PL-2303 (Chip H/HX/X) Linux driver for RedHat 7.3/8.0/9.0 Only.
NOTE: No need to install drivers for following:
Linux Kernel 2.4.31 and above already includes built-in drivers for PL-2303H, PL-2303XA/HXA and PL-2303HXD.
NOTE: Google Android OS is also based on Linux kernel so it also supports PL2303. 

Driver Source:
http://lxr.free-electrons.com/source/drivers/usb/serial/pl2303.c
http://lxr.free-electrons.com/source/drivers/usb/serial/pl2303.h

Kernel (go to \drivers\usb\serial folder):
http://www.kernel.org/pub/linux/kernel/

Accessing Serial Ports for Android:
http://code.google.com/p/android-serialport-api/