Skript Rank System:

This skript requires you to have the required plugins otherwise it won't work.
You have every right to edit the skript as much as you want.
You can change the commands in order to have another permission plugin (e.g. PEX) and some other tablist plugin

Commands:
/rank (player) (rank): sets a rank to a specific player of your choice
/merank: Shows your rank
/ranklist: Shows the list of the current ranks available. You will have to edit this if you want to change the ranks.
/grantperm (player) (GrantPermission): Gives a player the permission to set other ranks that are higher than their rank op will not work. To give yourself
the permission you will need to change this line from if player is "wNiko": to if player is "(yourname)".
/removeperm (player) (GrantPermission): Removes a permission from the player you want. If they have op they will not be able to give themselves a higher rank anymore.

Required Plugins:

NameTagEdit:
https://www.spigotmc.org/resources/nametagedit.3836/updates
Group Manager:
https://www.spigotmc.org/resources/groupmanager.38875/
**This Plugins are completely free**

That is pretty much it I hope you like it.