VariableTriggers: http://dev.bukkit.org/bukkit-plugins/variabletriggers/
What it does is it allows for you to set triggers for things like, click triggers, walk triggers, area triggers and event triggers.
Basically, allow something like when you click a sign, it teleports you to your spawn, or when you walk it spawns footprints, very useful for servers.
It is also updated to 1.8