J2K is described as 'There are already very feature-rich joystick to keyboard mappers out there, be it JoyToKey or XPadder. However, both are not Freeware and both lack the possibility to easily switch configurations from outside the applications, which would be necessary if you use game front-ends' and is a Key Mapping tool in the system & hardware category. There are more than 10 alternatives to J2K for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best J2K alternative is AntiMicroX, which is both free and Open Source. Other great apps like J2K are Xpadder, JoyToKey, X360ce and reWASD.