Camera List Navigator is a 3ds Max script from kumodot for moving through all the cameras in a scene with a few clicks. It can select the active camera node from the current viewport, and it shows the total number of cameras alongside the one you are currently on.
Left and right arrows step through cameras sorted by name, while a dropdown gives one-click direct select and switch. Setting the active viewport to the camera you pick in the Explorer is handled too. Auto Range detects a camera's range from its first and last keyframes and sets the timeline to match, and it is on by default.
An Auto Select option, off by default, chooses whether the camera node is selected as you navigate or your original selection stays put. A layer filter scans the scene and lists every layer that contains cameras, so you can move only through the cameras on a chosen layer. A Refresh button updates the script after you change the scene.