Monado is an impressive open source XR runtime that aims to support a whole lot of hardware, with a focus on great Linux support and version 25.1.0 is out now.
The developer team at Discord released a new engineering blog post yesterday (December 8th) detailing lots of fixes, along with some Linux improvements.
Framework Computer BV have announced a nice big expansion of their sponsorship program with many open source events and Linux distributions benefiting from it.