Linux CentOS 64-bit
CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor. CentOS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible. (CentOS mainly changes packages to remove upstream vendor branding and artwork.) CentOS is a free operating system based on Red Hat Enterprise Linux (RHEL). It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution. CentOS stands for Community ENTerprise Operating System.
Red Hat Enterprise Linux is available only through a paid subscription service that provides access to software updates and varying levels of technical support. The product is largely composed of software packages distributed under either an open source or a free software license and the source code for these packages is made public by Red Hat.
CentOS developers use Red Hat’s source code to create a final product very similar to Red Hat Enterprise Linux. Red Hat’s branding and logos are changed because Red Hat does not allow them to be redistributed.
Linux Fedora 32-Bit
Fedora is a Linux-based operating system, a collection of software that makes your computer run. You can use Fedora in addition to, or instead of, other operating systems such as Microsoft Windows™ or Mac OS X™. The Fedora operating system is completely free of cost for you to enjoy and share.
The Fedora Project is the name of a worldwide community of people who love, use, and build free software from around the globe. We want to lead in the creation and spread of free code and content by working together as a community. Fedora is sponsored by Red Hat, the world’s most trusted provider of open source technology. Red Hat invests in Fedora to encourage collaboration and incubate innovative new free software technologies.
Linux Ubuntu 32-Bit
Ubuntu Server Edition offers technology and resources to make a private or public cloud. Ubuntu Enterprise Cloud (UEC) provides virtualization capability, applications and flexibility to help deploy a cloud within an organization. It consists of the open core Eucalyptus, libvirt, KVM or Xen virtualization technology.
The server edition provides features such file/print services, web hosting, email hosting, etc. There are a few differences between the Ubuntu Server Edition and the Ubuntu Desktop Edition although both use the same apt repositories. The main difference between the two editions is the lack of a default installation of a X window environment in the server edition, although GUIs can be installed like GNOME/Unity (Ubuntu 11.04), KDE (Kubuntu 11.04), XFCE, (Xubuntu 11.04), as well as more resource-economical GUIs such as Fluxbox, Openbox and Blackbox. Kernel versions also differ. The server edition uses a screen mode character based interface for the installation, instead of a tarted-up graphical installation process. The server CD also has the option of installing Ubuntu enterprise cloud.
Ubuntu Server is also distributed free of charge. Users can choose to pay for consulting and technical support. Annual support contract with 9×5 business hour support is about $750 per server, and a contract covering 24×7 over a year costs $1,200.
Windows 2008 R2 64-Bit
Windows Server 2008 is built from the same code base as Windows Vista; therefore, it shares much of the same architecture and functionality. Since the code base is common, it automatically comes with most of the technical, security, management and administrative features new to Windows Vista such as the rewritten networking stack (native IPv6, native wireless, speed and security improvements); improved image-based installation, deployment and recovery; improved diagnostics, monitoring, event logging and reporting tools; new security features such as BitLocker and ASLR; improved Windows Firewall with secure default configuration; .NET Framework 3.0 technologies, specifically Windows Communication Foundation, Microsoft Message Queuing and Windows Workflow Foundation; and the core kernel, memory and file system improvements.
Processors and memory devices are modeled as Plug and Play devices, to allow hot-plugging of these devices. This allows the system resources to be partitioned dynamically using Dynamic Hardware Partitioning; each partition has its own memory, processor and I/O host bridge devices independent of other partitions.
Linux is nothing but an operating system that was started by Linus Torvalds, at the University of Helsinki in Finland. Linux is used for a large number of applications such as networking, development of software and as end-user platform. People often consider Linux to be an excellent and a not very expensive substitute to a lot of other expensive operating systems. Because of Linux’s good functions and its availability, it is quite in demand all across the world and a large number of s/w programmers are making use of the Linux’s source code in order to meet their individual needs.