Bukkit

Vault is a Economy/Permission plugin for hooking into the various Economy and Permission plugins.

Set up custom villager shopkeepers

The modern Essentials suite for Spigot and Paper.

Multiverse Inventories allows you to control who and what can cross world borders!

A collection of useful commands and features for server admins and players.

Allows server admins to easily modify how Minecraft works without programming anything

This is a easy to use GUI shop plugin.

Get custom items on join.

Enchant any item with whatever you want, add lore to items, rename items too! UberEnchant has it all!

Inexpensively protects your ores from cheaters.

The best chest&sign shop system for Bukkit

Replicate first-person shooters with advanced gun-mechanics and a vast number of exciting and fully customisable features.

Jobs Reborn

The all in one Shop plugin, With a sexy GUI, Sleek code, and light weight performance!

Commandless, Multi World, Player Owned Shops (Vault)

Orebfuscator - Anti Xray

Another auction house plugin.

A amazing plugin that allows you to create your own jobs for your players. The plugin is 100% configurable so you can change everything you see, it is also open-source if you want to take a look on how it's made.

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

LimitDrops