Holo was released earlier this the summer for both iOS & Android, but where it really shines is on the Apple platform, where it is optimized for ARKit’s enhanced VR environment. With the iOS app you’ll be able to walk around a hologram character as if it’s in the same room as you.
The Astral app is still in beta, so it’s not on the Apple Store yet, but its source code can be downloaded from its product page in GitHub.
Launched a few days ago, Sprayscape is an open source app for Android that enables you to take 360 degree photos. A Sprayscape photo is panoramic, but is taken from a VR point of view & is all around you.
TeleportCall VR can spice things up a bit by letting both ends of a call go on a VR expedition in which the caller & receiver share a curated 360 degree video landscape.