Camera Lister is a free addon for Blender 2.80 that lists all the cameras in your scene so you don’t have to search them through the Outliner among other objects, and allows you to easily switch between them.
To access the Camera Lister panel, use the shortcut Alt + C.
You can take it from here:
This addon is based on this proposal I made on Right Click Select:
And special thanks to @Secrop without whom I wouldn’t have been able to write all the functionalities the way I wanted.