Wineskin is a tool used to make wrappers to run Windows software on Mac OS X.  The wrappers are in the form of a normal Mac .app Application, which can be double clicked and ran just like its native.  They can also be used to make a distributable “port” of software.  You do not need the Windows program’s source code, you can attempt to port any program you want.  Best of all, its free!

Make wrappers for specific programs to share with others, make ports of your own open source, free, or commercial software, or just make a port for yourself!  Why install and use Windows if you don’t need to?