I listed it by team according to who I thought may be available. Seattle, Tampa, Baltimore, New England, Oakland, and San Diego appear the most promising.
Seattle: Trent Dilfer, Brock Huard or Seneca Wallace.
Tampa Bay: Brian Griese, or Jason Garrett.
Philadelphia: Koy Detmer or Jeff Blake, maybe neither.
Baltimore: Kordell Stewart, Anthony Wright or Josh Harris.
San Diego: Drew Brees, Doug Flutie, or Joe Germaine.
Pittsburgh: Tommy Maddox, Brian St. Pierre, or Kurt Kittner.
New England: Jim Miller or Kliff Kingsbury
Oakland: Rich Gannon, Kerry Collins, Tee Martin, or Marques Tuiasosopo
Denver: Bradlee Van Pelt, Matt Mauck, Mike Quinn, or Danny Kanell
Cleveland: Kelly Holcomb, Luke McCown, Nate Hybl, or Todd Husak
Indianapolis: Joe Hamilton or Jim Sorgi
Miami: Jay Fiedler...could happen, they invested in Feely
street FAs Shane Matthews, and Chris Redman