Castleford have announced that Ashley Gibson, Michael Channing and hooker Brandon Moore will leave the Super League club at the end of the season.
Centre Gibson, 28, has 11 tries in 28 Tigers games following his 2013 move.
Fellow centre Channing, 23, has scored eight tries in 29 league games for Cas after initially moving on-loan at the end of the 2013 campaign.
Moore, 19, a graduate of Cumbria's RFL academy, played three first-grade games for the Tigers.
"All three players have been a credit to our club," Castleford CEO Steve Gill told the club's website.
"On behalf of everyone here at Castleford Tigers I would like to wish them all the best in the future."