.. History, owner, features ..
Loot - Chests can be configured to generate Loot. For example, the Stronghold area contains tons of chests that can be looted over and over.
Essentials - Trade using a currency. Use special signs like trading signs and heal signs.
WorldEdit - Admins can help you clear out areas, build structures or replace blocks with others.
WorldGuard - Areas can be protected so that only you can build and access chests
mcMMO - Adds a leveling system for a set of skills that makes things like mining, excavation, sword fighting and much more more rewarding and fun.
MultiWorld - The server supports more worlds than just the original ones.
WhatisDB - A realtime help database that contains helpful information about the server and all kinds of other stuff.