Elementary OS

Elementary OS is easy to use and fast running Linux OS based on Ubuntu
You can try out by installing OS or directly for live CD.

OS has it own App center link Mac and look and feel is also quite inspired from Mac

 

 

 

 

 

For more check out http://elementaryos.org/

Update: Elementary is proud to announce the stable release of elementary OS Freya. After a year and a half of development.