I started using Rumbletalk and it was great since.

It offers you really a lot! A lot! You can change your backround, chat weight, height, design, text style, you can use it as a chat window or as a floating chat as well.

It works on mobile and tablets, it allows you to send videos, pictures, charts. You can do a voice or video calls, can speak public or on private and it just looks beautifully.