uPano (Unity Panorama Solution) is a universal multi-platform solution for displaying dynamic and static panoramas, and creating virtual tours.
uPano is very easy to learn and use, and is great for people who do not have programming experience.
Visual Tour Maker lets you create virtual tours in minutes.
In most usage scenarios, you can make interactive panoramas without creating your own scripts.
If you have some very specific purpose, uPano has a powerful and easy-to-use API that will allow you to implement any behavior.

The new version of uPano asset is already available.
Changelog:
[API] Fixed incorrect hooks in InputManager to adapt to the new input system.
[Keyboard Control, Mouse Control, UI Buttons Control] Added adaptive sensitivity based on FOV.
[Mouse Control] Added the ability to not start moving on UI in Left Mouse Button Down mode.
[Mouse Control] Fixed an issue where changing FOV with the mouse wheel used deltaTime.
[Tour Maker] Fixed display issues when entering play mode.
[Transitions] Fixed an exception when Directional Warping Transition was started not from an interactive element.
[Unity] Removed support for Unity 2018.4 - 2019.3 due to Asset Store requirements. Now requires Unity 2019.4 and higher.