Dynmap is a really cool plugin, where it gets a website for you to view your server as a map. Not only that, but they also display players that are online using their heads. When you play a server that claims chunks, it also shows the territories and their owners.
I was amazed at how it is not in Aternos plugin tab, as it is really cool when used in a factions, survival, and towny/economy server. If there is a reason behind it, please let me know and also let me know if it is a good suggestion.