Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
Chatrandom - Chatrandom provides medium to users for having chat at random with different users around the globe.
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
LuckyCrush - Live random video chat
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming