Bukkit

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

CoreProtect

Allows Ops to record players movements and play them over again

Stop Combat Log, Toggle PvP, No Kill Abuse, Newbie protection, Stop region border hopping

PowerRanks

Custom backpack items in vanilla Minecraft!

Players in creative can 1-hit-kill mobs when crouching

Lockette v1.4 - Simple chest and door lock, no databases!

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

Get custom items on join.

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

Lightweight Essentials! usefull commands and features for Minecraft! [Lightweight Essentials]

PlotSquared

Votifier

All what you need for economy on your server. Money/Shops/Jobs/Towns

bPermissions

Schedule configurable server wide broadcasts easily

ServerSigns - Bind player and server commands to signs

Inexpensively protects your ores from cheaters.

The banning plugin that does everything. Properly.