EntityGearUp

Summary

You can simply right-click an entity with items to make them wear those items!

What does it do

Only lets mobs wear things they CAN wear
In survival, it will take the item away from you, but you get your item back 100%, so you can safely equip a zombie for a nice challenge :)
In creative, you can just equip away, like you would expect from creative (mobs get no increased chance of dropping the armor/weapons you put on them!)
Automatically puts item into correct position
Also support blocks on heads, items in hand, etc.

Commands & Permissions

entitygearup.use - Permission node to use the plugin

OPs have all permissions by default, so you don't need permissions if you want to give only OPs the permissions.

Submit suggestions and bugs here!!

Metrics

This plugin uses MCStats to collect information about plugin usage. Of course, this is strictly anonymous, and you can easily opt out via plugins/PluginMetrics/config.yml. The NSA isn't watching your server ;) You can of course see for yourself what data is collected on the MCStats site, just the basic stuff: how many servers, how many players, which Bukkit version, etc.