1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
SafeNote - Encrypt and send files and notes with a link that automatically destruct after being read. SafeNote is a free web-based service that allows you to share a note or a file with confidentiality. There is no way to spying on you even to a hacker.
Hamster Pad - A social network built on top of Slack
Cryptgeon - Securely share self-destructing notes
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network