DashView
The DashView application (https://www.dashview.co.uk) is a server-based multi-purpose display screen tool with the power to efficiently update display screens for all types of viewer. DashView was inspired by a demand for easier presentation methods.
Rather than a Powerpoint or similar presentation having to be uploaded to any display screens in use, you can just set the display screens running any reasonably modern browser in full-screen mode, and you can upload images, links to other web-sites, and anything you choose. Your images are saved to your account available to be accessed anywhere!