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