Next month, free agency will commence in the NFL and some snappers will be able to offer their services to other teams. Unrestricted free agent snappers, who can sign with any club, are Ken Amato (Titans), Matt Katula (Vikings), Mike Leach (Cardinals), Chris Massey (Bears), Don Muhlbach (Lions) and Joe Zelenka (Falcons).   JJ Jansen of the Panthers would have been an unrestricted free agent but recently signed a new contract through the 2015 season.  Another snapper, Garrison Sanborn of the Bills, also reached a new deal and will be under contract through 2014.