Two biggest name kickers available today:
Mason Crosby and Robbie Gould.
Crosby of course played for McCarthy for all of his career and McCarthy stuck with him after a couple sub par seasons earlier in his career. He's also slightly younger than Gould. Last yr Crosby was 25/29 on FG's and 37/39 PATs. Crosby has also never missed a FG at AT&T stadium. He's supposedly considering retirement and the Packers said they have not closed the door on him returning there, but they did draft a PK last weekend.
Gould was 27/32 on FG's last yr and 50/51 on PATs. His preference (reportedly) is to kick for the Bears again, and the Niners drafted Jake Moody in the 3rd rd last weekend.
Both kickers have been excellent in the playoffs. Gould has NEVER missed a postseason kick (field goal or PAT) in 16 career games. (29/29 FG's, 39/39 PATs) Crosby is 31/35 FG's and 70/70 PATs.