Name: Advanced Firework
Link: https://dev.bukkit.org/projects/advanced-firework
This is a similar plugin to the Hypixel /fw command. With this easy free to use firework plugin you can type /fw and then it will open a GUI where you can choose between different powers and different colors. It also has permissions to for example only MVP can use this command.
I hope to see it in the Aternos Plugin selector soon!