From Marc Moini:
Scroll Wheel+ : Smoother, more comfortable scrolling for your trackpad or mouse. Hover Scroll: Just hover the cursor near the top or bottom of a window and relax, no need to keep scrolling. Auto Scroll: Read more comfortably with automatic, hands-free scrolling. Scroll Keys: scroll from the keyboard with the same keys in all applications. Vector Scroll: popular with Windows and Firefox users, now available for all Mac apps. Other features include independent reversal of trackpad and mouse, trackpad and scroll wheel acceleration, and more.
What's new in this version:
- New: Ready for OS X El Capitan.
- Fix: Smart Scroll would sometimes need to be restarted in System Preferences (Thanks, Chris Kresser!)
- Minor fixes and improvements.