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CommandGUI | FunctionsGUI is a handy plugin that allows you to create as many and different GUIs (user interfaces) as you need for your server.

Features:

With CommandGUI you can send commands, messages to players.
You can also charge money for it via Economy (Vault and Economy plugin required).
You can decide per slot if the players need certain permissions or not.
You can play a custom sound for each slot.
You can also open another GUI directly via slots.
You can also just display information by setting a lore for the items in the GUIs, these also support placeholders.
There is an item that players can get in the inventory, with which they can open a specific GUI.

Optional:

Permission Plugin LuckPerms recommended
Vault
Economy Plugin Recommendations: Economy, EssentialsX, CMI (Paid) (more possible)

/commandgui - Open the default GUI (adjustable)

/commandgui [gui] - Open the selected GUI

/gui-item on - Activate the GUIItem for you.

/gui-item off - Disable the GUIItem for you.

/commandguihelp - Open the help file.

/commandguiadmin info - Open the CommandGUI info.

/commandguiadmin createdefaultgui - create a default GUI

/commandguiadmin reload - Reload the plugin.