MoonOS - A feel of Mac OS X in Linux

MoonOS is a lightweight Linux distribution which uses the Enlightenment window manager and is based on Ubuntu/Debian, having a touch of the Mac's OS X.
According to MoonOS' official website, the focus of Moon is speed, low memory use, and attractive looks:
MoonOS' download is sizable, weighing in at 832MB, but the system requirements are very basic:

• 700 MHz x86 processor
• 384 MB of system memory (RAM)
• 8 GB of disk space
• Graphics card capable of 1024x768 resolution
• A network or Internet connection is neededif you want to download extra software

The dock of MoonOS is quite similar to the OS X version, it still possesses all the customization that Linux users have come to expect. This includes: 

• positioning the dock on the top, sides, and bottom; 
• controlling the size of the icons' magnification when they are moused over; 
• the color and appearance of the dock, such as 2-D or 3-D; 
• and even creating more than one Docky.

 There are 2 well known versions of MoonOS:

moonOS E17 Edition & moonOS LXDE Edition
moonOS E17 Edition use Enlightenment DR17 as its default window manager. moonOS LXDE Edition use LXDE as its default window manager. Its fast and lightweight, good for older/smaller computers. moonOS LXDE Edition replaces GRUB with, moonOS toolset and more
Applications included are:
    * OpenOffice.org, the default office program
    * Mozilla Firefox, the default web browser
    * Exaile, the default music player
    * Transmission, the default BitTorrent application
    * GIMP, the default graphics editor
    * Totem Movie Player, the default video player
    * Brasero, the default optical disc burning software
    * Pidgin, the default instant messaging client
It is believed that moonOS is a fork of Linux Mint because it has a similar user interface as Mint, and Moon's IRC client opens the Mint help channel when launched.

References:

http://moonos.org