avaamo - Simple, Secure Business Messaging
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
SupportKit - Embed Zendesk support into your iOS app with 1 line of code
Chatous - Chatous - random chat with real people from all over the world! Make friends with text or video chat.
Slack - A messaging app for teams who see through the Earth!
LuckyCrush - Live random video chat