wjoy is described as 'Nintendo wiimote driver for Mac OS X'. There are four alternatives to wjoy for Mac, Windows and Linux. The best alternative is FreePIE, which is both free and Open Source. Other great apps like wjoy are Wiiji (Free), CWiid (Free, Open Source) and DarwiinRemote (Free, Open Source).
FreePIE (Programmable Input Emulator) is a C# utility for bridging and emulating input devices. It has applications primarily in video gaming but can also be used for VR interaction, remote control, and other applications.
Wiiji is the perfect joystick solution for Wii remotes on Mac. With Wiiji, your Wii remotes will appear as ordinary joysticks to any application that supports joystick input. It does this through a kernel extention.