One important decentral service in the internet is xmpp / jabber. A live transport protocol which is mostly used to chat.

For this we host a free xmpp server for open registration under the domain chat.sum7.eu.

These support all necessary extensions:

And support secure way to connect: xmpp.net score

So it is at your to free your daily messages on your device (and encrypt then with OMEMO):

You should prefer a native App, the Webinterface is just a alpha-version which could already use OMEMO.

Webinterface: chat.sum7.eu

Application Store
Pix-Art Messenger Get it on F-Droid Get it on Google Play
Conversations Get it on F-Droid Get it on Google Play
Dino Downloads
Gajim Downloads for most common Desktops
Monal
ChatSecure ChatSecure on iOS App Store