Hi Leszek ..
i have some own solutions used in VR projects with diferent reqirements ..
here my list for "all i one VR-MM-Gallery" i would buy straight away:
featured medias:
- fotos monoscopic
- fotos stereoscopic
- self hosted videos
- YT/Vimeo etc. hosted videos
- stereoscopic videos (self hosted)
(all mentioned medias "flat" - not 360°)
- animated picture sequences (animated hotspots)
- 3D objects with three.js (i am just dreaming

!!)
than:
- adjustable UI (exchangable spread pic to cropp ..)
- adjustable alignment of all UI elements
- presentation art to choose (single pic, wall with thumbs, etc..)
so buddy keep going, i wil be you frist client
greetz
mil