Bukkit

Manage worlds

Religion based warfare plugin, with custom religions and custom effects.

Cave Ore Veins

Worldgenerator for a tropic/rainforest look

Cobblestone Generators will create ores as well as cobblestone

Powerful and full automatic SurvivalGames with an own WorldGen.

OreWorld crazy worldgenerator

Dwarven Delight

skySMP+ - SkyBlock survival multiplayer implementation.

Will allow you to manage adventour map with griefing options, and players own version of the maps!

Generate an epic world of floating islands!

Islands

SkyRider

Generates an infinite SkyGrid world. Idea by SethBling

Adds an element of surprise to the otherwise bleak world of mining!

helps to handle trees on your servers very easy

Explore a randomly generated Dungeon packed with loot

Adds various arcade games into Minecraft

HolySoulMaker

An addon to Orebfuscator to prevent X-RAY hacks