Keyclick Server is a Mac OS X preference pane that provides adjustable audio feedback for keystrokes, mouse clicks, scroll wheel movement, and trackpad gestures. With Keyclick, users can improve the perception of keyboard responsiveness, or add audio feedback when using tap-to-click or two finger scrolling on trackpad-equipped computers.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
