OnionDrop is a dead drop messaging system for hidden service operators. The hidden service can be found at http://oniondropodx6dyg.onion/ And more about the project can be found at http://oniondropodx6dyg.onion/about
UPDATE: The hidden service has been shuttered owing to disuse, if you sent a message or believe you received a message you can contact me on keybase to retrieve and/or delete the encrypted message(s)