Bukkit

The visual teleport plugin (/back, /home, location manager, ect)

Spawn, Home, Work, Warp, Back, Jail and TpTo commands!

Create portals similar to those in Valve's Portal!

Random Spawn

IslandWorld - Survive on small isle

DeathTpPlus, Deathnotify, Deathtp, Tombstones, Tombs and more

Its a plugin, but its mod-like: New mechanics, new worlds, custom bows and strucutres, faster game, survival reinvented.

jCommands - UUID Ready

Inspect ender chest and inventory of players and entities.

Convert worlds into instanced dungeons.

Duties

A fun way to get around your world.

FBasics - Factions fixes & more!

Teleport using buttons with price/reward/custom messages

A simple and easy to configure plugin that lets you announce to the server when a new player joins for the very first time.

Steve Home Protect

Provides automated plots with protection (MultiWorld support)

The minigame now in plugin form!

Towns can now require buildings that do stuff

A simple homes plugin w/ multiple homes.