FantasyRig allows you to view Sabermetrics for your players in ESPN and Yahoo fantasy baseball.
Get an edge on your league-mates. While looking at your team or free-agency pool, quickly evaluate players with essential Sabermetrics like wOBA, BABIP, and wRC+. You can customize which stats you want to see.
You can also view rest-of-season projections from three different projection systems. For points leagues, the extension calculates rest-of-season fantasy points.