TiltPad 1.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Games, more precisely Tools. The actual developer of this software for Mac is appnea.
From the developer:
TiltPad turns your iPhone into a motion sensitive game controller. It works with any video game and uses your iPhone's motion sensors to control your gaming via iPhone tilting!
Select your computer from your iPhone. Use your iPhone as a mouse vertically and as a "tilt sensitive" remote control in landscape mode.
You may want to check out more Mac applications, such as Generator, ExaChess Lite or Bones, which might be similar to TiltPad.