AntiCheatReloaded helps server admins combat the use of hacked clients and spambots. It analyses the behavior of players and can prevent malicious gameplay. The plugin offers a lot of customizability and can be connected across multiple servers in case it is used in a server network context. AntiCheatReloaded is based on gravitylow's AntiCheat and has been around since 2012.

Plugin Link:

https://www.spigotmc.org/resources/anticheatreloaded.23799/