Matrix is an open standard for interoperable, decentralised, real-time communication
popular [mobile] client:
Element, formerly Riot Chat http://element.io
DICOM (Digital Imaging and Communications in Medicine) is a standard format that enables medical professionals to view, store, and share medical images irrespective of their geographic location.
OpenSource:
https://medevel.com/10-open-source-dicom-viewers/
Aliza: https://www.aliza-dicom-viewer.com/download/download_alizams
ClearCanvas: https://clearcanvas.github.io/
MicroDicom (free for non-commercial use) https://www.microdicom.com/
[formerly https://github.com/Asymmetrik/node-fhir-server-core]
An Open Source secure REST implementation for the HL7 FHIR Specification. For API documentation, please see https://github.com/Asymmetrik/node-fhir-server-core/wiki. - GitHub - Asymmetrik/node-fhir-server-core: An Open Source secure REST implementation for the HL7 FHIR Specification. For API documentation, please see https://github.com/Asymmetrik/node-fhir-server-core/wiki.
Maybe an alternative to both MythTV and MPD?