Smart Scroll enhances regular scroll bars so that they indicate how much of a document is displayed in a window. The indicator tab in the scroll bar becomes proportional: if a window is displaying half of a document, the tab will be half the scroll bar size. This gives you an idea of how large the document is without your having to scroll down the window to find out.
Version 3.7.3 is a maintenance release adding support for Mac OS 9.2.2.
System 7.0 or later
*Previously available here