#2 FreeBSD:

FreeBSD is an OS that is to be watched for. There are many server admins and operators who swear that this OS is the best server OS till date. The OS has a rich history in the enterprise sector and is also well known for its clear cut BSD appearance along with UNIX system as the core. Admins say that FreeBSD is good for web sites and apps and handling traffic across the web.

FreeBSD is a successor of AT&T UNIX. The kernel, device drivers, and all of the userland utilities, such as the shell, are held in the same source code revision tracking tree.

Want more news on FreeBSD? Check this- Yahoo uses FreeBSD in their servers and so do Microsoft to power up their mail servers, Hotmail. People say that the OS pose the same disadvantages as other operating systems, but it can be replaced using certain patch ups and packages.