MLBTR's 2013 MLB Free Agent Tracker is now available. The tracker allows you to filter free agents by many criteria: team, position, signing status, years, and dollars. Also, we will be replacing the Type A/B filter with a qualifying offer one shortly. For the most part, our cutoff for a player's inclusion on the tracker is 50 MLB plate appearances or 20 innings pitched in 2012.
We also have a basic list that shows which free agents remain available at each position, found here.