Bukkit

WorldGuard

Mine spawners with silk touch

Override /server

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

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

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

Expand the capabilities of Skript with skRayFall

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

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

WildSkript

Orebfuscator - Anti Xray

Inexpensively protects your ores from cheaters.

Bssentials GroupManager

#1 Scoreboards plugin!

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

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

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

Hide and Custom your Plugins and other Commands!

Set your server spawn as a superior

Fake slots number and slot limitations bypassing!