[[http://www.virtualradarserver.co.uk/ Virtual Radar Server]] allows you to host your own, web based, [[https://en.wikipedia.org/wiki/Automatic_dependent_surveillance-broadcast ADS-B]] plotter. It will provide a webpage showing the location of, and information on, aircraft that are transmitting ADS-B messages. These messages, of course, have to be received. Luckily this can be accomplished cheaply and easily. Check out some of the following links.
https://www.adsbreceiver.net/