From https://nlnet.nl/news/2025/20250422-announcement-grants-CommonsFund.html, 42 open-source projects got funded through the October call of the NGI Zero Commons Fund. Two of them have an XR focus:
https://nlnet.nl/project/FlockXR/
3D visual creativity and coding tool
Flock XR is a visual creativity and coding tool that allows young people to create 3D experiences in a web browser. Flock XR allows young people and beginners to create apps relevant to the virtual worlds that they use socially. Through creating with Flock XR, young people develop technical and creative skills such as coding and working in 3D space with 3D models and animations. They will be able to create using extended reality features including VR, Augmented Reality, 3D printing and spatial audio.
https://nlnet.nl/project/XR-Teamware/
Design, deploy, federate and integrate portable XR experiences
XR Teamware will develop a publishing platform/forge for XR content, and a Blender plugin with direct import export capabilities to said forge and to Icosa gallery. This would allow 3D creators to easily publish and share their ideas, and preview metadata in Blender before exporting.