Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Noor - Chat like you're in the office together
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
ZipMessage - ZipMessage replaces live meetings with asynchronous conversations.
Tinychat - Chat with multiple people at one time using this group app.
Angle Audio - Live audio conversations as a service