Public - Group chats.
Postmodern.app - Anonymous, short, ephemeral conversations with others
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Roomvine - Chatrooms for real life venues, neighborhoods and events
Chalk - Chalk is a calculator that tries to do right what others do wrong.
Berkanan - Chat with people nearby. Even offline, on an ✈️.