Public - Group chats.
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
SoChat - Chat with everyone
Hamster Pad - A social network built on top of Slack
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network