This seems like the EssentialsX power tools feature.
/pt | Assigns a command to the item in hand. Use 'c:' as the command to make a chat macro. Use 'a:' to append multiple commands. Use 'r:' to remove a single command. Use 'l:' to list all power tools Use 'd:' to remove all power tools
> Whitelist
You can whitelist your server to only allow certain players to join
`/whitelist on | off` - Activates / deactivates whitelis
`/whitelist add (player)` - Adds a player to the whitelist
`/whitelist remove (player)` - Removes a player from the whitelist
`/whitelist list` - Shows the whitelist