.McMMO -Mine, fish, and fight to gain experience in specific skills.
.Tardis -Build your very own Tardis, and travel to distant worlds. Build your own base in there, if you want.
.UpgradableTools Upgrade (/ut) any gear as it gains experience.
.EliteMobs -Battle fearsome versions of vanilla mobs, even bosses. The drop unique gear you can use, or sell (/em sell). The gear has enchants you cant get anywhere else. You can even level up to fight harder battles and gain better gear.