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XMPP

What's XMPP (official website)
XMPP FAQs (more)

Overview:  XMPP is the Extensible Messaging and Presence Protocol, a set of open technologies for instant messaging, presence, multi-party chat, voice and video calls, collaboration, lightweight middleware, content syndication, and generalized routing of XML data.


There are quite a few clients available. You can check the overview here.

You can use our XMPP server and federate to others by using your LibertaCasa SSO credentials.

JID: username@liberta.casa
Password: your SSO password

Currently, you can use any XMPP/Jabber client to connect to the following server:

Host: xmpp.liberta.casa
Port: 5222
TLS/SSL: Enforced

Installing a desktop client, i.e. Dino or Gajim is recommended. Mobile client in the form of Android, i.e. Conversations, or iOS, i.e. Siskin, clients are viable options as well.

Alternatively, you can use the Converse.JS or Candy webchat, however keep in mind that those are both highly experimental services,  making for an extremely rudimentary experience with no guaranteed functionality.