IScroll2

iScroll2 is a modified trackpad driver written by Daniel Becker to allow two-finger scrolling on iBook and PowerBook models released before January 31, 2005, when the feature was introduced by Apple Computer for its new USB-based trackpads.

Description
iScroll2 adds two-finger functionality to earlier ADB-based trackpads used in iBook G4 and Aluminum PowerBook G4 models released from 2003 to 2004. It does not support older PowerPC G3 notebooks and the first 12-inch Aluminum PowerBook G4 (867 MHz). Developed from openly available Darwin source code, iScroll2 was initially released on February 7, 2005.

Software conflicts
iScroll2 may interfere with the functionality of other trackpad drivers, such as FingaMIDI or SideTrack.