Instant messaging

See Video conferencing for wishlist.

https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols is a bit overwhelming. If we allow Wikipedia to editorialize a bit for us, https://en.wikipedia.org/wiki/Template:Instant_messaging has a more manageable list.

Extensible Messaging and Presence Protocol (XMPP) (formerly Jabber)

Servers

ejabberd
- Website
- Wikipedia
- Source code
- XMPP features
  - https://xmpp.org/software/ejabberd/
- Tech: Erlang
- Server requirements “If deployed on a 16 GB RAM machine with at least 4 cores, a single ejabberd node can typically handle 200-300 K online users”
Prosody IM
- Website
- Wikipedia
- Source code
- Tech: Lua

Clients

Dino
- Website
- Source code
- XMPP features
  - https://xmpp.org/software/dino/
- Tech: GTK/Vala
- Platforms: Linux
Conversations
- Website
- Source code
- XMPP features
  - https://xmpp.org/software/conversations/
- Tech: Java
- Platforms: Android

Jabber ID (JID)

<user>@<host>/<resource>

XMPP Extension Protocol (XEP)

https://xmpp.org/extensions/
XEP-0004 Data Forms
XEP-0030 Service Discovery
XEP-0045 Multi-User Chat (MUC)
XEP-0050 Ad-Hoc Commands
XEP-0060 Publish-Subscribe
XEP-0115 Entity Capabilities
XEP-0133 Service Administration
XEP-0163 Personal Eventing Protocol (PEP)
XEP-0166 Jingle
XEP-0167 Jingle RTP Sessions
XEP-0234 Jingle File Transfer
XEP-0272 Multiparty Jingle (Muji)
XEP-0280 Message Carbons
XEP-0313 Message Archive Management (MAM)
XEP-0369 Mediated Information eXchange (MIX)
XEP-0357 Push Notifications
XEP-0384 OMEMO Encryption
XEP-0479 XMPP Compliance Suites 2023

OMEMO Multi-End Message and Object Encryption

References

Hacker News “Discord Alternatives, Ranked” comment subtree

See also