Porting Kit - Install Windows Games in Mac OS X natively and easily and for free with Wineskin technology
CodeWeavers CrossOver - Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.
Vineyard - Windows programs on Linux, easily
Wine - Open Source Software for running Windows applications on other operating systems.
Lutris - Lutris is an open source gaming platform for GNU/Linux.
VMware Workstation - VMware Workstation is a multiple operating system handler to easily evaluate the any other type of new operating systems.