Adebayo Akinfenwa is among six Northampton players offered new terms, while six have been released.
Northampton Town have signed former Gillingham striker Gary Mulligan in an intial one-year deal.
Gillingham have announced the release of seven players but are keen to keep Simon Royce and John Nutter.
Mark Stimson is determined to keep Simeon Jackson at Gillingham and has warned off any potential suitors.
Gillingham striker Gary Mulligan has signed a new one-year deal with the club.
Striker Gary Mulligan is keen to leave Gillingham in the wake of the club's relegation to League Two.