The list of players at the center position who are free agents as of July 1, 2013:

Unrestricted:
Dwight Howard - LA Lakers
Andrew Bynum - Philadelphia 76ers
Al Jefferson - Utah Jazz
Chris Kaman - Dallas Mavericks
Zaza Pachulia - Atlanta Hawks
DeJuan Blair - San Antonio Spurs
Nazr Mohammed - Chicago Bulls
Joel Przybilla - Milwaukee Bucks
Jermaine O’Neal - Phoenix Suns
Ryan Hollins - LA Clippers
Ronny Turiaf - LA Clippers
DeSagana Diop - Charlotte Bobcats
Jason Collins - Washington Wizards
Johan Petro - Atlanta Hawks
Earl Barron - Washington Wizards
Cole Aldrich - Sacramento Kings

Restricted:
Nikola Pekovic - Minnesota Timberwolves
Timofey Mozgov - Denver Nuggets
Tiago Splitter - San Antonio Spurs
Samardo Samuels - Cleveland Cavaliers
Dexter Pittman - Memphis Grizzlies
Josh Harrellson - Miami Heat
Robert Sacre - LA Lakers

Player Option:
Aaron Gray - Toronto Raptors
Kwame Brown - Philadelphia 76ers

Team Options:
Ekpe Udoh - Milwaukee Bucks
Kevin Seraphin - Washington Wizards
Gustavo Ayon - Milwaukee Bucks