This software adds sliding and fading effects to windows. It's called Haxie.
One of the best things about Slider is how unobtrusive it is. It doesn't overwhelm you with flashy animations or slow down your computer. Instead, it just adds a subtle effect that can make a big difference.
With Slider, you have the ability to customize your experience. This preference pane allows you to select which applications are enhanced with the haxie or apply it globally. You can choose between an Up->Down or Left->Right sliding effect, enable or disable opening and closing animations independently, and adjust the effect duration and sliding width.
It's worth noting that Slider is an Application Enhancer module and requires the Application Enhancer 1.2 or later to function. Once installed, though, it's a simple and effective way to add some flair to your MacOS X experience.
Version 1.3: N/A