Bukkit

This is a plugin that can keep out griefers from your server. It will warn everyone that that specific player is griefing.

Slap people on your server!

QuickRegion quickly adds region flags

Shows the player a random joke

Detailed auction house using the team menu.

Portable Tools is a plugin that allows you to open various different inventory types on command.

Makes arrows and snowballs and egs goo boom!

Have realistic explosions in Minecraft!

Log the ranks of your players to a simple text file

Extend Hoppers' Usefulness

Broadcast a configurable message when a player joins containing their city, country, weather, local time, e.t.c

CookieRun

CommandPackage

EasyChest allows your player to have a chest with them.

Lest you do /tsd to set the time to day

Search a mansion for hidden bodies to find the truth, or be a ruthless but strategic murderer!

MAI allows you to toggle item frame visibility and open containers through the frames!

ClassyTp

ToxicSurvival

If the player has TNT when they die, they explode!