NBA free agents are players whose contracts have run out. They're no longer signed to a team. They're out of work, and need a new contract, either with the same team or a new one.

Explanation of restricted NBA free agents: Players can sign with any team in the league that offers them a valid contract. They're totally free to go where they want.

Explanation of restricted NBA free agents: Players who are restricted free agents can re-sign with their most recent team, or sign an offer sheet with a new team. But if they do the latter and sign an offer sheet elsewhere then their previous team has the right to match the contract of that offer sheet and re-sign the player, whether the player wants them to or not.

There are also player options and team options. If a player's contract is a player option for the season, it means the player has the ability to "opt out" of the contract and become a free agent. And if a player's contract says that this season is a team option, then as you'd guess, the team has the option to decline the option and cause the player to become a free agent.

Key NBA Free Agent Dates: In the summer of 2013, NBA free agent negotiations begin July 1, 2013. Players and teams can negotiate, and agree to deals, but nothing can become official yet. The date NBA free agents are able to officially begin signing contracts is July 10, 2013.

2013 NBA FREE AGENTS LIST
Updated September 20, 2013

Source: South Florida Sun-Sentinel

Atlanta Hawks: Devin Harris (signed with Mavericks), Ivan Johnson (signed to play in China), Dahntay Jones, Kyle Korver (signed with Hawks), Zaza Pachulia (signed with Bucks), Johan Petro (signed to play in China), Josh Smith (signed with Pistons), DeShawn Stevenson, Jeff Teague (signed with Hawks), Anthony Tolliver (signed with Bobcats).

Boston Celtics: Kris Joseph (signed with Magic), Donte Green (signed to play in China), Shavlik Randolph, Chris Wilcox, Terrence Williams.

Brooklyn Nets: Andray Blatche (signed with Nets), Jerry Stackhouse, C.J. Watson (signed with Pacers), D.J. White (signed to play in China).

Charlotte Bobcats: DeSagana Diop, Gerald Henderson (signed with Bobcats), Josh McRoberts (signed with Bobcats), Byron Mullens (signed with Clippers), Jannero Pargo (signed with Bobcats), Tyrus Thomas, Reggie Williams (signed with Rockets).

Chicago Bulls: Marco Belinelli (signed with Spurs), Daequan Cook, Richard Hamilton, Nazr Mohammed (signed with Bulls), Vladimir Radmanovic, Nate Robinson (signed with Nuggets), Malcolm Thomas.

Cleveland Cavaliers: Omri Casspi (signed with Rockets), Wayne Ellington (signed with Mavericks), Daniel Gibson, Kevin Jones, Shaun Livingston (signed with Nets), Chris Quinn, Marreese Speights (signed with Warriors), Luke Walton.

Dallas Mavericks: Rodrigue Beaubois, Elton Brand (signed with Hawks), Darren Collison (signed with Clippers), Bernard James (signed with Mavericks), Mike James (signed with Bulls), Chris Kaman (signed with Lakers), O.J. Mayo (signed with Bucks), Anthony Morrow (signed with Pelicans), Brandan Wright (signed with Mavericks).

Denver Nuggets: Corey Brewer (signed with Timberwolves), Andre Iguodala (signed with Warriors), Timofey Mozgov (signed with Nuggets), Julyan Stone (signed with Raptors).

Detroit Pistons: Will Bynum (signed with Pistons), Jose Calderon (signed with Mavericks), Corey Maggette, Jason Maxiell (signed with Magic).

Golden State Warriors: Jarrett Jack (signed with Cavaliers), Dwayne Jones, Carl Landry (signed with Kings), Scott Machado, Kevin Murphy.

Houston Rockets: Aaron Brooks (signed with Rockets), Carlos Delfino (signed with Bucks), Francisco Garcia (signed with Rockets).

Indiana Pacers: D.J. Augustin (signed with Raptors), Ben Hansbrough (signed to play in Europe), Tyler Hansbrough (signed with Raptors), Jeff Pendergraph (signed with Spurs), David West (signed with Pacers), Sam Young.

Los Angeles Clippers: Matt Barnes (signed with Clippers), Chauncey Billups (signed with Pistons), Ryan Hollins (signed with Clippers), Lamar Odom, Chris Paul (signed with Clippers), DaJuan Summers (signed to play in Europe), Ronny Turiaf (signed with Timberwolves).

Los Angeles Lakers: Devin Ebanks (signed with Mavericks), Earl Clark (signed with Cavaliers), Chris Duhon, Andrew Goudelock (signed to play in Europe), Dwight Howard (signed with Rockets), Antawn Jamison (signed with Clippers), Darius Morris (signed with 76ers), Robert Sacre (signed with Lakers), Metta World Peace (signed with Knicks).

Memphis Grizzlies: Tony Allen (signed with Grizzlies), Austin Daye (signed with Raptors), Keyon Dooling, Donte Greene (re-signed by Grizzlies, traded to Celtics), Jon Leuer (signed with Grizzlies), Fab Melo (signed with Mavericks).

MIAMI HEAT: Chris Andersen (signed with Heat), Juwan Howard, Mike Miller (signed with Grizzlies).

Milwaukee Bucks: Gustavo Ayon (signed by Hawks), Samuel Dalembert (signed with Mavericks), Marquis Daniels, Mike Dunleavy (signed with Bulls), Monta Ellis (signed with Mavericks), Drew Gooden, Brandon Jennings (re-signed, traded to Pistons), Joel Przybilla, J.J. Redick (signed and traded to Clippers).

Minnesota Timberwolves: Chase Budinger (signed with Timberwolves), Mickael Gelabale (signed to play in Europe), Andrei Kirilenko (signed with Nets), Nikola Pekovic (signed with Timberwolves), Greg Stiemsma (signed with Pelicans).

New Orleans Pelicans: Al-Farouq Aminu (signed with Pelicans), Lou Amundson, Xavier Henry (signed with Lakers), Roger Mason Jr., Lance Thomas (signed with Pelicans).

New York Knicks: Earl Barron, Chris Copeland (signed with Pacers), Kenyon Martin (signed with Knicks), Pablo Prigioni (signed with Knicks), Quentin Richardson (signed and traded to Raptors, released by Raptors), J.R. Smith (signed with Knicks), James White (signed to play in Europe).

Oklahoma City Thunder: Ronnie Brewer (signed with Rockets), Derek Fisher (signed with Thunder), DeAndre Liggins, Kevin Martin (signed with Timberwolves).

Orlando Magic: Al Harrington (signed with Wizards), DeQuan Jones (signed with Kings), Beno Udrih (signed with Knicks).

Philadelphia 76ers: Andrew Bynum (signed with Cavaliers), Royal Ivey (signed with Hawks), Charles Jenkins (signed to play in Europe), Damien Wilkins (signed with Hawks), Dorell Wright (signed with Trail Blazers), Nick Young (signed with Lakers).

Phoenix Suns: Michael Beasley (signed with Heat), Diante Garrett (signed with Thunder), Hamed Haddadi, Wesley Johnson (signed with Lakers), Jermaine O'Neal (signed with Warriors).

Portland Trail Blazers: Luke Babbitt (signed to play in Europe), J.J. Hickson (signed with Nuggets), Eric Maynor (signed with Wizards), Nolan Smith (signed to play in Europe), Elliot Williams.

Sacramento Kings: Cole Aldrich, Toney Douglas (signed with Warriors), Tyreke Evans (signed with Pelicans), James Johnson (signed with Hawks).

San Antonio Spurs: DeJuan Blair (signed with Mavericks), Manu Ginobili (signed with Spurs), Tracy McGrady (retired from NBA), Gary Neal (signed with Bucks), Tiago Splitter (signed with Spurs).

Toronto Raptors: Alan Anderson (signed with Nets), Marcus Camby (signed with Rockets), Linas Kleiza (signed in Europe), John Lucas III (signed with Jazz), Mickael Pietrus, Quentin Richardson, Sebastian Telfair.

Utah Jazz: DeMarre Carroll (signed with Hawks), Randy Foye (signed with Nuggets), Al Jefferson (signed with Bobcats), Paul Millsap (signed with Hawks), Jamaal Tinsley, Earl Watson (signed with Trail Blazers), Mo Williams (signed with Trail Blazers).

Washington Wizards: Leandro Barbosa, Jason Collins, Cartier Martin (signed to play in Europe), A.J. Price, Garrett Temple (signed with Wizards), Martell Webster (signed with Wizards).

Source: South Florida Sun-Sentinel