Bukkit

MobHunting provides a fun way to get money from hunting monsters

Ping

Command Signs

Show WorldGuard regions on Dynmap's maps, with live update

BossShop allows you to create custom "GUI-Shops"

Simple broadcasting on your server.

Add functioning stats to your items to allow players to increase their player stats.

This plugin allows you announce/send Actionbar as message or on join/firstjoin (also ANIMATED ACTIONBAR)

Simple plugin to let you know the damage you just caused to a mob, and how much health it has left.

Gather statistics for your server such as playtime, blocks broken and pvp!

Create custom scoreboards using variables.

Automatically have player ranks change depending on how long they have been online.

The original PingTest is back! Let your players check their connection quality now.

UralClans2

UltimatePlugin

PlayerTrackerPlus

allows you to see commands being used by other users.

Player time on server tracking, with in game 'top player' lists, file based reports, and more.

Lets you check the server lag, in ticks-per-second

Lock your players chests, beacons, furnaces, beds, anvils and other containers even doors with just a sign.