1. WineHQ – If you were a  windows user , you might sometimes need to carry your favourite app to ubuntu. WineHQ is good at running such windows stuff . If you need to know if your favourite app runs on linux you can check this here . To download wine, check out this link .

2. VirtualBox – Most of you might be familiar with VirtualBox , from Sun Microsystems , a nice virtualization software which is available for free . There are many commercial virtualization softwares like vmware , which is much more powerful than virtualbox . To see a list of virtualization softwares have a look at this .

3.Scribus – Scribus is an opensource desktop publishing tool available for free . Scribus offers a modern and easy to use interface .and even supports advanced and professional features like CMYK color, separations, Spot Colors, ICC color management and  PDF creation.What to say more, visit its official website .

4.Gimp – Available by default in your Ubuntu machine . If you are interested in photo-editing  gimp would be a good start .Read more about gimp and how to use gimp .

5.Blender – Blender is an opensource 3-d content creation suite available for free . Blender is as effective as other commercial software like maya , 3-d max etc , without taking you in to complex processes. Blender is definitely worth a look , you can even watch  how powerful is blender viewing the blender, gallery page .

6. Other crazy stuff like vlc player ,firefox, evolution ,pidgin , openoffice , k3b disc burner , songbird , x-chat etc are definitely worth a look . Here are a few tutorials and reviews on getting in touch with various nice free software programs , take a look at them .

7.If you are interested in making your linux an eye-candy , then opt for compiz .Compiz offers a stylish look without sacrificing too much system resources . Oh ! , I know you need to make your linux appear similar to mac os , here it is it mac4lin .

Windows is never equivalent to Linux as both are distinct operating systems . I , here present my personal opinion .

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Origin of Linux operating system

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1. OpenVZ is an operating system-level virtualization technology based on the Linux kernel and operating system.It can take care of more than one os at a tim e like other virtualization technologies.
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3. VirtualBox is an x86 virtualization environment , made by  Sun Microsystems as part of its Sun xVM virtualization platform. A lot of  host operating systems like Linux, Mac OS X, OS/2 Warp, Windows XP or Vista, and Solaris, are supported in this. Supported guest operating systems include FreeBSD, Linux, OpenBSD, OS/2 Warp,linux Kernal 2.4/2.6, Windows and Solaris.It is great for home use and for testing programs which may other wise interfere with the os.
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5. Kernel-based Virtual Machine (KVM) is a Linux kernel virtualization infrastructure. KVM currently supports native virtualization using Intel VT or AMD-V. A wide variety of guest operating systems work with KVM, including many flavours of Linux, BSD, Solaris, and Windows etc. KVM is included with Debian, OpenSuse and other Linux distributions.
6. Xen is a virtual machine monitor for 32 / 64 bit Intel / AMD (IA 64) and PowerPC 970 architectures. systems to be executed on the same . XEN is included with most popular Linux distributions such as Debian, Ubuntu, CentOS, RHEL, Fedora and many others.It is very pleasant in its appeaance and easy to work with.It supports running several machines at the same time.
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8. Linux-VServer is a VPN  implementation done by adding operating system-level virtualization  to the Linux kernel making it an integral part of the operating system.
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   User Mode Linux (UML) was the first virtualization technology that was available  for the Linux Operating system.It has less performance and stability compared with others . Coming version support for x86 virtualization to UML may reduce this disadvantages.
10. VMWare is one of the leaders of virtualization technologies.It has extended to linux platforms .It is known for its advanced features.But a hefty price tag always follows.
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This is a piece of software from Sun which enables to run one operating system in another .I may explain,you can run windows or mac in linux or linux in windows etc.This is a good virtual Machine that it supports almost all os.This is available for windows and Linux .This has networking capabilities and it works exactly like the original os.You can make virtual disks or anything.This is a great competitor for VMware.It is said that it much better than VMware and it is opensource project.This is a perfect software for running two operating systems at the same time.This is free of charge and worth download.Go and give it a try.You will definitely love it.

You can download it from : http://www.virtualbox.org/wiki/Downloads

This software has good working community which is very active.

WIndows Vista in linux

The Different screenshots of installation can be found at virtual box official site.