Download of CornerClick 0.9 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Greg Schueler. The program lies within System Tools, more precisely System Optimization. We recommend checking the downloaded files with any free antivirus.
From the developer:
CornerClick allows you to assign actions to each corner of your screen in Mac OS X. Your screen corners can act like four buttons which will never move. You will never miss when you try to click the corner of the screen. The Dock is badly designed from a user interface point of view. If you have a lot of icons in your dock, either your icons are really tiny or you have magnification turned on.
You may want to check out more software for Mac, such as Dock Delight, which might be similar to CornerClick.