Software to host multiple camera images at once
Since the advent of HTML5 you can do this with a standard webpage that contains multiple  elements, with no special software required. This will embed a video in a page that any modern browser can see.

&lt;video width="320" height="240" controls&gt;
  &lt;source src="movie.mp4" type="video/mp4"&gt;
  &lt;source src="movie.ogg" type="video/ogg"&gt;
Your browser does not support the video tag.
&lt;/video&gt; 


A primer on the HTML5 video element here

Since you're streaming the video it's a little more complex, you need to use the media source extension. If you want to look at how streaming works, there's a good guide here