Scroll Reverse
Reverses the scroll direction on macOS. Useful if like to change this setting when switching between using the trackpad and a mouse. You can set the scroll direction via the command line with the following (choosing either true or false)
defaults write NSGlobalDomain com.apple.swipescrolldirection -bool true/false
However this requires a logout / login to take effect.
Running this script toggles the scroll direction via System Preferences and so the effects are immediate.
Add To Dock
To add this script to the dock, open scroll-reverse.scpt in Script Editor and save as Application. Add this new app to the Accessibility list (System Preferences > Security & Privacy > Privacy). Drag the new file to the dock. You can change the app icon by right-clicking to Get Info and then pasting an image onto the default image.