In the last week, Baseball Savant has released their new catcher framing model, and the site has also published graphics displaying a catcher’s ability to get an extra strike based on a quadrant outside of the strike zone. The model culminates in a “runs extra strike” category, similar to what Baseball Prospectus has with their framing runs and same with Fangraphs.
Baseball Prospectus has long been the main face of public pitch framing models. Dan Turkenkopf, now of the Brewers, was really the first to dive into pitch framing.