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Riot.im

Riot is a place to chat. But it brings much more than just a chat room. You can chat with one to one or add people or  join chat room or create chat room.

All is federated and you have a name like user:server.com So you can add people from other servers. The first server is matrix.org.

Additionaly you can share files, images and make audio or video calls. And you can add widget like etherpads for example

This alternative can easily be used like watsapp or such centralised app. You have to know that watsapp belong to facebook and all is heard by NSA or other surveillance services.

If you are not convinced, all is very secure decentralised and encrypted end-to-end. And of course this is opensource. Try it on riot.im/app/

 

You can use application on your smart phone too of course.

If you want to try go to riot.im