Roundio - Explore what people posted to Instagram or Flickr near you
Crypho - End-to-end-encrypted messaging and file sharing
Circle.so - Bring together your discussions, memberships, and content. Integrate a thriving community wherever your audience is, all under your own brand.
MushRoom - KnockKnock the person whom you want to message and he/she should accept your knockRoom or Group can be created by providing a nameShare Room link with your friends to join the conversationWatch video or listen music during conversation
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Roomvine - Chatrooms for real life venues, neighborhoods and events