JoyToKey - JoyToKey enables users to control the keyboard using any USB compatible controller (Dualshock 3, Xbox 360, etc.)
wjoy - Nintendo wiimote driver for Mac OS X
Xpadder - Xpadder simulates the keyboard and mouse using your gamepad What does Xpadder let you do?
Wiiji - Wiiji is the perfect joystick solution for Wii remotes on Mac.
Keysticks - Control your PC using an Xbox controller instead of the mouse and keyboard
Joystick 2 Mouse - Joystick 2 Mouse is a little utility which gives mouse usefulness to associated joysticks and joypads.