Plays typewriter sounds as you type.
Adjust screen brightness from the menu bar, just like with volume.
Change your display colors in ways more suited to low light conditions (such as at night).
Browse files and navigate folders directly from the Finder's contextual menu.
Get iOS-type reverse scrolling for OS X.
Organize your desktop: move and resize your application windows.
For people working in a Windows-dominated office environment.
Preference pane that removes apps from Launchpad without deleting them.
Status bar utility for changing audio input/output device.
Toggle Mac function keys - make the secondary action the default.