Matrix is an open-source decentralized E2EE messaging protocol.
Here are the european instances you can sign up at:
๐ฌ๐ง UK: matrix.org
๐ซ๐ท France: tendomium & imagisphe.re & hadoly.fr
๐ฉ๐ช Germany: tchncs.de, catgirl.cloud, pub.solar, yatrix.org, digitalprivacy.diy, oblak.be, nope.chat, envs.net, hot-chilli.im, synod.im & rollenspiel.chat
๐ณ๐ฑ Netherlands: bark.lgbt
๐ฆ๐น Austria: gemeinsam.jetzt & private.coffee
๐ซ๐ฎ Finland: pikaviestin.fi
For desktop use Element
For mobile use Fluffy Chat
Let me know if I missed any instances and I will be sure to update the post.