Wine - Run Windows Applications in Linux

Most of the Linux users who has moved from Windows miss their favourite Windows Application or Game. Though there are many Linux equivalent softwares for many Windows applications , but their numbers are few compared to Windows softwares.
To solve this , a project started in 1993 for giving the Linux users the joy of installing and using popular windows application in Linux. And the result is Wine , a program loader capable of running windows applications on Linux.

How to install:
For ubuntu users just open terminal and type
$ sudo apt-get install wine
and the software will be installed from internet. If you don't have an internet connection or slow internet connection you can install it offline.
Most others Linux Distro contains wine by default. You can also download the latest source file from here compile it yourself.

What are the applications supported :
Wine allows a lot of popular windows applications to be installed on Linux. Some of them are
WinRar, MS Office (Installer Only) , Quicktime etc.
Among popular games it supports Half Life 2 , Day of Defeat , Call of Duty etc.
For a full list of applications supported and necessary configurations visit wine home page at
http://appdb.winehq.org/