Thought this might be helpful for discussions. This list is not comprehensive as I left certain players off because of fit, avtainability, or likelyhood of opting out - Iverson, Odom, and Harrington are respective examples.
Player Team Status Position Age
Ronald Murray ATL U G 30+
Marvin Williams ATL R F <25
Josh Childress ATL R G/F <25
Leon Powe BOS U PF <25
Glen Davis BOS U F/C <25
Sean May CHA R PF <25
Ben Gordon CHI U G <25
Aaron Gray CHI U C <25
Joe Smith CLE U F/C 30+
Wally Szczerbiak CLE R G/F 30+
Linas Kleiza DEN U F <25
Dahntay Jones DEN U G/F 25-30
Johan Petro DEN R F/C <25
Chris Andersen DEN R F/C 25-30
Walter Herrmann DET U F 25-30
Antonio McDyess DET U PF 30+
Zaza Pachulia HOU U C <25
Von Wafer HOU U SG <25
Ron Artest HOU U F 25-30
Rasho Nesterovic IND U C 30+
Jarrett Jack IND R G <25
Steve Novak LAC R PF <25
Quinton Ross MEM R G/F 25-30
Hakim Warrick MEM R F <25
Jamario Moon MIA U F 25-30
Charlie Villanueva MIL R PF <25
Shelden Williams MIN U F/C <25
Nate Robinson NYC R G <25
David Lee NYC R F/C <25
Chris Wilcox NYC R F/C 25-30
Robert Swift OKC U C <25
Desmond Mason OKC U SG 25-30
Rasheed Wallace ORL R F/C 30+
Grant Hill PHO U G/F 30+
Matt Barnes PHO R F 25-30
Marcin Gortat SAN U C <25
Ime Udoka SAN U G/F 25-30
Drew Gooden SAN U PF 30+
Anthony Parker TOR U SG 30+
Shawn Marion TOR U F 30+
Brevin Knight UTA U PG 30+
Paul Millsap UTA R PF <25
Morris Almond UTA R G/F <25
Some of these guys are sixth men like Ben Godron and Jarret Jack, others are rotation guys like Glen Davis and Chris Wilcox, while others are projects like Morris Almond and Shelden Williams.