From Ryan Hanson:
TouchOven "bakes" a handful more trackpad gestures into macOS, and lets you tie them to a custom action. The additional gestures are tap based and are easy to perform without getting in the way of normal trackpad use. Some example gestures include resting two fingers on the trackpad and tapping a third finger to the right, left, or between the resting fingers. When one of these gestures is performed, TouchOven can be set to execute a keyboard shortcut, manipulate browser tabs and state, execute specific keypresses or clicks, and more.