Bukkit

jail stick

DontSetThisBlock

WARNED! lets you warn players and have them kicked after a configurable amount or warnings!

Better Creative

Protection++

Towny Advanced custom Town wars

PMWarning

Canary is an anti-griefing and warning plugin. If it thinks that someone is breaking a house it will alert an admin.

No more Session Stealing

RosterMod

DontUseThat

Because normal muting plugins are boring: Troll your server's trolls back!

A curated collection of server modifications

Stop those pesky Planet Minecraft "Reviewers"

xicer craft

Filling Your Server With Kick-Ass Commands

PotionProtect

LavaFireTNT

Its Just a Dustbin :P

Allows staff on a server to incarcerate naughty players for questioning.