A simple Plugin to get the world in the chat. Useful with Multiverse.
No customization, I just use this plugin for myself and thought others might appreciate the chat style.

Color of the world depends on the environment: Normal, Nether or The End
"_nether" and "_the_end" gets cut off of the world name and it gets capitalized. That means that when a player in "world_nether" types a message it will become a red "World" followed by the username and message.

Enjoy