You can preview the images of all the cameras in the scene through this plug-in, you can filter unwanted cameras according to conditions, and you can save the camera pictures to your computer

Features:
*Multiple cameras windows preview
*Real-time show preview camera view
*Auto get all camera in scene
*Cull camera by it's name
*Show disabled camera view
*Set render resolution
*Export camera view to PNG file
*Easy to use

Works on 2019.1 upper version .
Tested only on windows system .
Please contact me if there are any problems !