Bukkit

WorldGuard

Mine spawners with silk touch

Detect and fight the exploitation of various flaws/bugs in Minecraft!

Override /server

A plugin to warn your players when your server will restart!

Expand the capabilities of Skript with skRayFall

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

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

Bssentials GroupManager

Lop off Player and all Mob Heads with configurable drop rates + pvp-farming nerf, includes detailed commands and permissions

WildSkript

Inexpensively protects your ores from cheaters.

#1 Scoreboards plugin!

CombatLog aims to punish players who log out to escape combat.

Orebfuscator - Anti Xray

PerWorldPlugins allows plugins to be set to hook onto certain worlds using the config.

Hide and Custom your Plugins and other Commands!

Fake slots number and slot limitations bypassing!

Join Message Plus allows you to change or turn off the join and quit messages of Minecraft.

Teleporting Made Easy