Seald - Keep your conversations secure, everywhere.
Bazoocam - Bazoocam is a popular chat website that rapidly connects you with strangers to chat.
Keybase Chat - End-to-end encrypted chat built into Keybase
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Zingo - Zingo is a communication app by Buzz Group Limited through which you can connect with a large community of other bright minds by engaging in live chat with them.