Matt Prior is eager for a role at Sussex following the club's relegation to County Championship Division Two.
Surrey all-rounder Zafar Ansari has signed a new three-year deal to cap a season that saw him called up by England.
Luke Wright has been named Sussex's new club captain following Ed Joyce's decision to step down from the job.
Essex batsman Jaik Mickleburgh has signed a new 12-month contract with the county.
Derbyshire opening batsman Billy Godleman has signed a two-year contract extension with the county.
Ed Joyce has stepped down as Sussex captain after their relegation from Division One of the County Championship.
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Wicketkeeper-batsman Ben Foakes has become the latest Surrey player to sign a new long-term contract.
Leicestershire batsmen Dan Redfern and Andrea Agathangelou will leave the club after not being offered fresh terms.
Kent have announced that batsman Sam Northeast will succeed Rob Key as their captain for the 2016 season.
Surrey seamer Tom Curran has signed a new three-year contract which will keep him at The Oval until 2018.
James Fuller has signed for Middlesex on a three-year deal after rejecting a new contract at Gloucestershire.
Northants have released batsman Kyle Coetzer and fast bowler Maurice Chambers after opting not to renew their contracts.
Chris Liddle and Ashar Zaidi have been released by Sussex, while Steffan Piolet has decided to retire from cricket.
Middlesex have released left-arm pace bowler Gurjit Sandhu after he failed to make a first-class appearance in 2015.
Durham's Chris Rushworth has been named PCA Player of the Year, with awards also going to Stuart Broad and Tom Curran.
Worcestershire have released left-arm spinner Shaaiq Choudhry, whose current contract has expired.
Former Surrey, Gloucestershire and Sussex player Roger Knight is to take over from David Morgan as president of MCC.
Essex batsman Mark Pettini is to leave the county and join Leicestershire on a three-year contract.
Yorkshire duo Jonny Bairstow and Jack Leaning have been named County Championship Cricketer and Young Player of the Year respectively.