Bukkit

lets you change your server MOTD with the players username, as well as give a random motd

Makes if you go really fast and get flame particles for a configurable duration.

PSI powers on your server!

Protection plugin for ByteCart network plugin

AVP

Info about the closest Villager on Command

SkyWars2

Let players use hashtags like on Twitter in the chat!

A simple GUI to spawn mobs

AntiBot

a GUI for your CraftBukkit (for Windows)

A program that blocks bad words. Use this if you are running a christian server or a server that doesn't want bad words.

Configurable farm animal summoning plugin.

A plugin that will apply effects and damage multipliers to players when they take damage

Sugar Cane Everywhere allows you to place Suger Cane on Sand and Dirt without water next to it.

CustomScoreboard

Automate your farms

Logs how many unique players join your server each day.

A plugin that adds a simulation of Pfaeff's Allocator Mod to multiplayer

BouncingBall