Roundio - Explore what people posted to Instagram or Flickr near you

Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.

Circle.so - Bring together your discussions, memberships, and content. Integrate a thriving community wherever your audience is, all under your own brand.

Keybase Chat - End-to-end encrypted chat built into Keybase

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

Crypho - End-to-end-encrypted messaging and file sharing