Wine (originally an acronym for "Wine Is Not an Emulator") is a compatibility layer capable of running Windows applications on several POSIX-compliant operating systems, such as Linux, Mac OSX, & BSD.
Open Source and User Driven
Wine will always be free software. Approximately half of Wine's source code is written by volunteers, with the remaining effort sponsored by commercial interests, especially CodeWeavers, which sells a supported version of Wine.
Source WineHQ Homepage: https://www.winehq.org/about/
To install Wine just run the following commands via your systems Terminal.
sudo add-apt-repository ppa:ubuntu-wine/ppa
sudo apt-get update
sudo apt-get install wine1.7 winetricks