What are some alternatives?
When comparing MouseImp and Scroll Reverser, you can also consider the following products
ScrollNavigator - ScrollNavigator helps you to scroll your documents horizontally and vertically. Simply click and hold down the right (or the middle) mouse button anywhere in a window and move the mouse to scroll the window contents.
Caldis MOS - A little job for your mouse.
Smooze - Smooze animates your scroll and adds functionality to your non-Apple mouse (scroll-wheel mouse).
DragToScroll - Allows you to scroll any window or control by right clicking (RButton) and dragging the mouse.
DS4Windows - DS4 Tool for Windows
Smart Scroll - Smart Scroll makes scrolling smoother, faster and more comfortable: