I think we're heard about a number of the big names, but maybe talk about some of the less hyped guys.
Giants released
CB Dominique Rodgers-Cromartie due to salary. So he potentially could be cheaper and while he's not a long term solution, he does seem to have the size and length that the Packers seem to be looking for and he's always been fairly athletic. Though he has admitted that he's better when a coach pushes him hard and really gets on him, I think the Packers have a DB coach that can do that. Also he can plus both inside and out.
Seahawks don't sound like they're interested in resigning
RB Eddie Lacy, who had a horrible year, and while Lacy has normally disliked the offseason, it sounded like he was relieved this offseason was finally hear, so he could attack his offseason work as he sounded more motivated than ever to get a great offseason in... a motivated Lacy in the offseason might be the perfect thing for him, and if a team can sign him cheap (with incentives) and put a half decent OL in front of him, he could potentially break out again, like averaging 5.2 yards per carry like he did when he was last with the Packers.
Colts
RB Frank Gore has been turning out 1,000 yard seasons with a horrible OL... what could he do with a better OL, QB and offensive system? Though the downside is he's about to turn 35 at a position that normally drops off at 30... but he's a different back than any of the current RB and might be a great short term mentor.
Seahawks
WR Paul Richardson and/or Redskins
WR Ryan Grant... both just had big breakout seasons for their team. I'm more interested in Richardson, because I think he's more explosive, younger and he's been playing with a question OL and used to a QB scrambling around. But there is also Grant, who has trained with Devantae Adam, hasn't missed a game in his career (yet) and the last time the Packers got a Ryan Grant out of the NFC East, he turned out to be pretty good.