What determines relevancy?
The submission must ideally be a blog or article about XMPP/Jabber and/or XMPP-based software (clients, servers, libs).
Some exceptions might be made, for example for a release page showing a new release of some XMPP-based software.
However, marketing brochures (e.g. single-page marketing sites) for new products which don't contain information on XMPP, won't be included.
The Debian XMPP Team has launched a blog!
Daniel Gultsch, of Conversations fame, has written a post on A pathway to a well regulated instant messaging market.
Kiran Jasvanee has written a piece on the discovery of the protocol: What is XMPP — iOS Perspective?
Mickaël Rémond from ProcessOne, has written a huge story on ejabberd & Nintendo Switch NPNS, on how they iteratively optimised the system.
Not related to XMPP, but to messaging in general, so maybe of interest, Tommy Crush of Instagram wrote a post on Making Direct Messages Reliable and Fast.
Guus has written a summary of the XMPP Sprint in The Hague, in Netherlands, in June 2019.
Another XMPP Sprint is coming in Lyon, France, in July. Stay tuned for one near you.
Extensions and specifications
ProcessOne has released ejabberd 19.05, improving MIX and MucSub.
Conversation's server compliance tester has been redesigned and is now easier to navigate.
Ignite Realtime has released Openfire 4.4.0 beta.
Conversations 2.5.0, 2.5.1, 2.5.2 added public channel search via search.jabbercat.org and reworked onboarding screens.
Movim has announced it is the the first XMPP app that has added emoji reaction to messages, in one to one conversations and chatrooms. It is making use of XEP-0367: Message Attaching. So support Movim now Patreon.
Librem 5 has made again a lot of progress, including Lurch OMEMO plugin for end-to-end encryption in the Chatty XMPP and SMS messaging for better privacy, and the UX features a new padlock and fingerprint display.
Tigase is Gold sponsor of the XSF!
The XSF has announced its participation in the Google Summer of Code 2019. The selected projects are: