MouseImp is described as 'PRO is a successor of MouseImp that became popular all over the world. Many users’ wishes were considered in this new version of MouseImp, and many improvements have been implemented, making it even faster and more reliable' and is an app in the OS & Utilities category. There are three alternatives to MouseImp for Mac and Windows. The best alternative is Smart Scroll. It's not free, so if you're looking for a free alternative, you could try DragToScroll.
Smart Scroll makes scrolling smoother, faster and more comfortable: Super Scroll: smoother, more comfortable scrolling for your trackpad or mouse. Try it! Hover Scroll: just hover the cursor near the top or bottom of a window and relax, no need to keep scrolling!
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.