Fix for macOS's unnecessary scroll acceleration
As of 2021, this fix works on all the recent macOS versions, specifically 10.9–11.
You may download the binary here. It runs in the background and allows you to scroll 3 lines with each tick of the wheel.
It needs to be run each time you boot. If you want this to be automatic you
may go to System Preferences > Users & Groups > Login Items and add
DiscreteScroll to the list. If you want to undo the effect you may launch
Activity Monitor, search for DiscreteScroll and force it to quit.