The unhackable Vanish plugin
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Help | Commands | Configuration | Permissions
VanishNoPacket allows players to control if they are visible to the rest of the players on the server. This is excellent for stalking potential bad users (griefers, hacking if you don't allow it, etc.), observing players while they remain unaware of your presence.
What makes VanishNoPacket awesome? VanishNoPacket tricks players into thinking you're not anywhere nearby, or not even on the server! Other players are unable to see you, while you can stalk them around the map watching for griefing or other unscrupulous behavior. A fine choice of invisibility for the discerning server administrator.

In this picture there are forty players. None of them can be seen. In this plugin we hope to show you how not to be seen.
Developers! Contact me if you support or are interested in supporting this plugin's hiding.
[ONELINER:Vanish from players with ease. Your server deserves the best in visibility control plugins!]