Bukkit

WorldGuard

Keep your inventory in a chest when you die !

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

Player and Mob Heads Full-featured plugin

Mine spawners with silk touch / Spawner Management

Expand the capabilities of Skript with skRayFall

Mine spawners with silk touch

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

Inexpensively protects your ores from cheaters.

Protect and lock Chests, Furnaces, etc. with a easy to use GUI.

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

Simple Sit

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

Keep your server running while mojang is offline, Supports all server versions!

Orebfuscator - Anti Xray

Herobrine

NoLagg

Make possible to have mending with enchant table

CombatLog punishes players who log out to escape combat.