2013 Free Agency: Star rating is out of five. Age listing as of Sept. 1, 2013.
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Brian De La Puente (RFA), C, Saints. Age: 28. Tendered by Saints (2nd round)
An undrafted free agent in 2008, Brian De La Puente has become one of the better centers in the NFL.
Fernando Velasco, C, Titans. Age: 28. Tendered by Titans (2nd round)
Fernando Velasco seemingly came out of nowhere to be a very effective center for the Titans in 2012. He also played some left guard.
Todd McClure, C, Falcons. Age: 36. Announced retirement
Todd McClure is still getting the job done despite being in his mid-30s, but he could completely drop off soon.
Dan Koppen, C, Broncos. Age: 33.
Dan Koppen was released by the Patriots because he wasn't able to get on the field after suffering tons of injuries. He was healthy at the end of this season, however, and performed pretty well for Peyton Manning.
Phil Costa (RFA), C, Cowboys. Age: 26. Re-signed with Cowboys (2 years)
Phil Costa is a serviceable starting center, but he's coming off foot surgery and may not be ready for the start of the season.
Evan Dietrich-Smith, C/G, Packers. Age: 27. Tendered by Packers (original)
A capable lineman who's versatile enough to play all three positions on the interior. He was an upgrade over the decrepit Jeff Saturday.
Rob Turner, C/G/OT, Rams. Age: 29. Signed with Titans
Rob Turner had a decent 2012 campaign for the Rams. He played center and guard, and he's capable of lining up at right tackle as well.