Postmodern.app - Anonymous, short, ephemeral conversations with others
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Roomvine - Chatrooms for real life venues, neighborhoods and events
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Blind - Yik Yak for the workplace. Chat anonymously with your team.
Treadie - Create your own micro-social network for topics