Bukkit

AntiBadWord plugin is useful for a server to prevent players from saying bad words.
In this plugin there is a subplugin called AntiBadCommand that instead prevents players from writing bad commands.

How to install it:
1. Download it.
2. Put its jar file in the plugins folder.
3. Start or reload the server and enjoy blocking the bad words.

Commands:

AntiBadWord:
/abw add <badword>: Adds a bad word.
/abw remove <badword>: Removes a bad word.
/abw list: Shows the list of bad words.
/abw about: Shows about AntiBadWord.
/abw reload: Reloads AntiBadWord.

AntiBadCommand:
/abc add <badcommand>: Adds a bad command.
/abc remove <badcommand>: Removes a bad command.
/abc list: Shows the list of bad command.
/abc about: Shows about AntiBadCommand.
/abc reload: Reloads AntiBadCommand.

Permissions:

AntiBadWord:
antibadword.badword.add - /abw add <badword>
antibadword.badword.remove - /abw remove <badword>
antibadword.reload - /abw reload

AntiBadCommand:
antibadcommand.badcommand.add - /abc add <badcommand>
antibadcommand.badcommand.remove - /abc remove <badcommand>
antibadcommand.reload - /abc reload

How works:

Bad words:
When a player says a bad word, it will be replaced with "[No Bad Word]" and him will show a message that says: "You said a bad word".

Bad commands:
When a player writes a bad command, it will be cancelled and him will show a message that says: "You written a bad command".