Bukkit

Vault is a Economy/Permission plugin for hooking into the various Economy and Permission plugins.

WorldGuard

A collection of useful commands and features for server admins and players.

The essential plugin for Spigot servers.

With this plugin you can cut down an entire tree by breaking the bottom part!

Plugin Manager For Bukkit

A simple homes plugin with the ability to create, delete, and teleport to many different homes.

Remove lag and improve the performance of your server significantly with this tool!

ServerSigns - Bind player and server commands to signs

Allows server admins to easily modify how Minecraft works without programming anything

If you've ever used the VeinMiner mod for minecraft Forge, it has now been recreated for Bukkit, CraftBukkit, and Spigot

Keep your inventory in a chest when you die !

A plugin which teleports you to your set home.

Change your ingame skin

Fully customize any mobs (and create custom mobs) with a powerful scripting skill system, attributes, equipment, special AI, and much more, along with custom spawners and spawning rules. The ultimate plugin for making RPG servers and minigames.

Tablist

Unique and challenging custom achievements or quest-like objectives on your server! Books, fancy GUI, rankings, rewards, effects and more!

BukkitGUI - the most downloaded GUI for bukkit and any other server

Get custom items on join.

Enchant any item with whatever you want, add lore to items, rename items too! UberEnchant has it all!