Grimsby sign former Portsmouth midfielder Ben Davies on a two-year contract and Scunthorpe forward Dominic Vose on loan.
Grimsby have completed a loan deal for Scunthorpe midfielder Dominic Vose.
Northern Ireland international Michael Smith signs a new three-year contract with Peterborough United.
Colchester have signed winger Brennan Dickenson on a free transfer after his Gillingham contract expired.
Walsall sign West Ham United's teenage midfielder George Dobson on a season-long loan deal.
Colchester United sign former Gillingham versatile left-back Brennan Dickenson and ex-Chelmsford centre-back Dexter Peter.
Gillingham midfielder Josh Wright has signed a new two-year contract with the Sky Bet League One club.
Millwall striker Paris Cowan-Hall has returned for a third spell at Wycombe after agreeing a loan deal until the end of January.