Rotherham defender Stephen Kelly has agreed a new one-year deal at the New York Stadium.
Grimsby sign former Portsmouth midfielder Ben Davies on a two-year contract and Scunthorpe forward Dominic Vose on loan.
Plymouth Argyle sign three players including Scotland international David Goodwillie, while Ryan Brunt signs a new deal.
Millwall striker Paris Cowan-Hall has returned for a third spell at Wycombe after agreeing a loan deal until the end of January.
Hartlepool United sign forward Lewis Alessandra on undisclosed terms, following his release by Rochdale.
Hartlepool have signed striker Lewis Alessandra following his recent release by Rochdale.
Wycombe Wanderers re-sign Millwall forward Paris Cowan-Hall for the third time as he joins on loan until 1 January.
Notts County sign midfielder Michael O'Connor on a two-year deal, the third player to join from Port Vale this week.