Looking for advice on development technologies for VR

I’m looking for advice based on your experiences with different VR technologies.

I understand that Unity is predominant for game development, but I’m curious on what technologies are in use for development of non-game apps.

I’m coming at this from mobile development with an understanding that a dev can build an app for android using Java/Kotlin etc to build up their app system from there. They also have the option of developing using Unity which will abstract development away from the Java/Kotlin side of things.

Is this similar for VR development or am I completely off the mark here?