Bukkit

Mention players in the chat by their names

A plugin to instantly filter out blacklisted words (i.e. stop people from swearing).

ClearChat is often used to protect the chat from advertisers and spammers.

Designed to offer simple private death messages for staff and players

FailCommand: Say goodbye to '?SPAWN' and other failed commands !

Automatically promote players based on how long they've been on the server!

Play Russian Roulette how it's supposed to be played, with death.

ServerSafeguard

Powerful chat plugin that suits your needs

Have your own staff chat for a spigot server

Discord inspired join messages, in Minecraft.

PerWorldMessages

This plugin allows players to "record" the chat. — Part of the Samaritan Suite

Strike derpy users in public, for all to see/hear.

Broadcast admin messages to the server

Send your coordinates by discord

An easy to setup and use auto-announcing plugin.

ServerArchitect lets you customize your server

Battle Dome plugin with awesome side-features. Be sure to play with your friends. Not for automated servers!

Dis-allow spam on your server!