Nowadays, everything is browser-based even the best graphic games now are given as a Cloud services.
So a new standard of communication has been implemented years ago in the modern browsers called WebRTC (Web Real Time Communication) integrated with a voice filter to remove any noises as well as a sharing screen service. Amongst these we have :
Free Rooms (Without signing in, You need just to share the link)
While these needs an account and would save your conversations
- Google Hangout : needs a gmail
- Web Skype : needs a skype account or a microsoft mail like hotmail or live
- Rabbit.it : to stream together