Bukkit

SilentJumpPads

An Open-Source plugin to add new crafting recipes to existing non-craftable vanilla items.

Automatically ignites TNT when placed

Disable crafting of items

Traditional, easy to set up Team PvP

Doesn't allow you to say words, configurable!

Kills player when they step on a specific block.

Add more mobs to your server

AntiCreep

Blacklist block placement and item crafting, per player and group!

experiBank

Bringing StarTrek into Minecraft! A Plugin to build lightweight Spaceships for moving, exploring and Space-PvP

EasyBlocks

Change which hostile mobs can be hostile to players

Activate button and lever with command

PigZomibes die in sunlight

NoMoreRollBacks || REVIVED

This is minecraft but you can't touch grass, netherrack or endstone.

BlockPhysics

Teleport to your friends at the cost of 1 experience level