Kits, Period.

Kits, Period is a kit plugin with GUIs for modifying and selecting kits

Commands:
/createkit <kit name>: Creates a kit with name <kit name>
/modifykit <kit name>: Opens the modification GUI for <kit name>
/kit: Opens the kit selection GUI
/deletekit <kit name>: Deletes kit with name <kit name>
/kiticon <kit name>: Sets the icon of kit with name <kit name> to item in your hand
/kitperm <kit name>: Sets the permission node for kit with name <kit name>
/kitcooldown <kit name> <timestamp>: Sets the cooldown for kit with name <kit name> to <timestamp>

All of the below examples set the cooldown of "Warrior" to 2 hours:
/kitcooldown Warrior 2h
/kitcooldown Warrior 2hours
/kitcooldown Warrior 60min
/kitcooldown Warrior 59min60sec
/kitcooldown Warrior 7200seconds
Warning: Any number over 99999h won't save properly.

Permission Nodes:
kitsperiod.create: /createkit
kitsperiod.modfy: /modifykit
kitsperiod.delete: /deletekit
kitsperiod.kit: /kit
kitsperiod.icon: /kiticon
kitsperiod.kitperm: /kitperm
kitsperiod.cooldown: /kitcooldown

OPs can execute all of the commands.