Xpadder - Xpadder simulates the keyboard and mouse using your gamepad What does Xpadder let you do?
Keyboarding Master - Product webpage for Keyboarding Master
reWASD - First and only gamepad mapper to make Xbox Elite paddles separate buttons.
lmctl - lmctl is a software that let you control and customize your logitech mouse.
JoyToKey - JoyToKey enables users to control the keyboard using any USB compatible controller (Dualshock 3, Xbox 360, etc.)
Smoothmouse - Smoothmouse is experimental project to improve mouse & trackpad usability in OS X.