Gillingham have released nine players but offered new deals to Adebayo Akinfenwa and Chris Whelpdale.
Striker Akinfenwa, 32, scored 10 goals in 34 league appearances for the Gills in 2013-14 while winger Whelpdale, 25, featured 28 times in all competitions.
Midfielder Charlie Lee and forwards Craig Fagan and Myles Weston are among those leaving the League One club.
Gary Borrowdale, Steven Gregory, Sam Baxter, Adam Birchall, Joe Carter and George Howard have also been released.
Youngsters Stephen Butcher and Sam Muggleton have also departed Priestfield.
Lee joined the Gills from Peterborough in summer 2011 following a loan spell the previous season and the 27-year-old scored a total of 11 goals in 111 appearances for the club while winger Weston, 26, scored 10 goals in 82 outings after moving to Kent in August 2012.
Birchall moved to Gillingham from Dover in summer 2011 but the striker's spell with the club was beset by injury, and the 29-year-old scored one goal in 21 appearances.
Goalkeepers Baxter and Howard and defenders Borrowdale and Carter did not make a senior appearance for the Gills.