Bukkit

Skip the night with a percentage of players or a vote and an animation.

A complete match and event framework for creating arenas and minigames in Minecraft. Supports creating modes through config files, or fully custom modes through plugins.

A complete rpg plugin with custom items that give the wearer powerful abilities and are obtained by defeating custom bosses

A fully customisable RPG plugin that allows you to create Guilds with distinct advantages and disadvantages.

Let your Discord members know what's happening on your server using webhooks. Everything is configurable!

Town claiming and capturing with global kingdoms, resident management and stats/titles

Detailed stats tracking with web portal

Does not allow Endermen to pickup blocks, also does not allow Skeleton Horses to spawn.

Knapsacks are backpacks on steroids. Craft or give knapsacks to players plus many more features!

Backpack, ever need extra-storage while you run around? This is the answer to your problems.

Mail

Reduce or remove all server lag, Use 2x less ram as before!

Custom enchants from books, like CosmicPVP!

RemoteBukkit allows admins to, with the help of a plugin, remotely use the server's console.

Chest Linking, Hopper Filtering, Remote Chests & Menus! [Now with AutoCrafting!]

FunnyGuilds is a fully customizable RPG plugin that allows you to create guilds

Automated taxes and salaries

PlugMan is a simple, easy to use plugin that lets server admins manage plugins from either in-game or console without the need to restart the server.

Allows players to get spawn eggs by throwing regular eggs at mobs.

Summons little gremlins to organize your chests when you're not looking.