The usage of the WiFi Photo Transfer Free app is straightforward. Open the app and notice the URL shown. In case of the example shown in the screenshot below (image 1), it is http://172.16.172.120:8080.
Now use this URL in the address-bar of your favourite browser on any other system and your camera roll should appear, as shown in the second screenshot (image 2).
If the built-in App webserver fails to start and you see an error, use the settings page (accessed through the cogs in the upper right) to set another port number, for example, 8081.
If you want your browser with the camera roll to show the image location as shown in image 3, you need to set the Google Maps API key in the settings pane.
Link to demo video: https://youtu.be/lkqMv_qpPpM