2013 Free Agency: Star rating is out of five. Age listing as of Sept. 1, 2013.
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Andy Levitre, G, Bills. Age: 27. Signed with Titans (6 years, $46.8 million)
Andy Levitre is a stud guard who excels in pass protection. He also showed off his versatility, playing decently at left tackle in some games in 2011.
Louis Vasquez, G, Chargers. Age: 26. Signed with Broncos (4 years, $23.5 million; $13 million guaranteed)
Louis Vasquez parlayed a strong offseason with a great 2012 campaign. He was rock solid in an otherwise pedestrian offensive front. He should be heavily compensated.
Kevin Boothe, G/C, Giants. Age: 30. Re-signed with Giants (1 year)
Kevin Boothe is a tough run-blocker. He's versatile enough to play center as well.
Willie Colon, G/OT, Steelers. Age: 30. Signed with Jets (1 year, $1.2 million)
Willie Colon can play both guard positions as well as right tackle. He's a very powerful blocker, and he would be rated much higher if he didn't have a troublesome knee that has forced him out of multiple games over the past several seasons.
Brandon Moore, G, Jets. Age: 33.
Brandon Moore is coming off a terrific season. He run blocked with the best of them and wasn't a liability in pass protection. Age, however, is becoming a concern.
Ramon Foster, G, Steelers. Age: 27. Re-signed with Steelers (3 years)
Ramon Foster is a quality starter. He pass protects well, but struggles in terms of run blocking.
Donald Thomas, G, Patriots. Age: 27. Signed with Colts
Donald Thomas didn't get to play very much behind Logan Mankins and Dan Connolly, but when he did, he definitely made the most of it. He could be a starter on many teams.
Tyronne Green, G, Chargers. Age: 27. Signed with Patriots
Tyronne Green wasn't very good in 2011, but improved enough this past year to be a capable starting guard.
Ryan Lilja, G, Chiefs. Age: 31. Announced retirement
Ryan Lilja has been a tremendous run-blocker for the Chiefs. He also showed versatility, moving to center following Rodney Hudson's injury. Unfortunately, he couldn't get over a knee injury this season, and he has even contemplated retirement.
Matt Slauson, G, Jets. Age: 27. Signed with Bears)
Matt Slauson is sound in pass protection, but doesn't run block very well. He beat out Vladimir Ducasse for the starting left guard job in 2012.
Chad Rinehart, G, Bills. Age: 28. Signed with Chargers (1 year)
Chad Rinehart did a phenomenal job replacing Andy Levitre in 2011 when the stud guard had to move around in the wake of injuries to Eric Wood and Demetress Bell. Unfortunately, Rinehart missed most of 2012 with an ankle injury.
Kory Lichtensteiger, G, Redskins. Age: 28.
Kory Lichtensteiger was OK at times when blocking for Robert Griffin, but he was penalized 10 times in 2012, which is a ridiculous amount.
Stephen Peterman, G, Lions. Age: 31.
Stephen Peterman played well a couple of years ago, but struggled last season in terms of pass protection. Maybe he'll be able to rebound in a city.
Cooper Carlisle, G, Raiders. Age: 36.
Cooper Carlisle pass protected well last season, but struggled to open up running lanes for Darren McFadden and Marcel Reece. Carlisle will be 36 in August, so he shouldn't get anything more than the veteran minimum.
Brian Waters, G, Patriots. Age: 36.
Brian Waters is a six-time Pro Bowler who most recently was voted as such in 2011. However, he quit on the Patriots because of financial reasons. He didn't play at all in 2012. It's unknown how much he has left.