CleanChat is a very good plugin for server owners who don't want to allow cursing on their server! CleanChat is an anti-curse plugin which is very easy to install and use! Just drag and drop the .jar file into your plugins folder. After running the server at least once after installing, a folder in your plugins will appear titled "CleanChat". Inside that folder will be a config.yml file, inside that file will contain all of the words you don't want to be said on your server. If a player attempts to chat with one of those words, the message will not be displayed and CleanChat will send the player a message warning him or her not to use that word again on the server.