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?
DarwiinRemote - SourceForge presents the DarwiinRemote project. DarwiinRemote is an open source application.
Keysticks - Control your PC using an Xbox controller instead of the mouse and keyboard
reWASD - First and only gamepad mapper to make Xbox Elite paddles separate buttons.