Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Seald - Keep your conversations secure, everywhere.
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
Crypho - End-to-end-encrypted messaging and file sharing
LuckyCrush - Live random video chat
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.