Cedega is described as '(formerly known as WineX) was TransGaming Technologies proprietary fork of Wine (from the last version of Wine under the X11 license before switching to GNU LGPL ), designed specifically for running games created for Microsoft Windows under Linux'. There are five alternatives to Cedega for a variety of platforms, including Mac, Linux, BSD, Wine and Android. The best alternative is Wine, which is both free and Open Source. Other great apps like Cedega are PlayOnLinux (Free, Open Source), CrossOver (Paid), Q4wine (Free, Open Source) and WineBottler (Free, Open Source).
Wine is a free, open source application for running Windows software on operating systems that are normally not supported. With Wine, you can install and run these applications just like you would in Windows.