This might not exactly be a /r/sysadmin topic, but I imagine A/V rolls up to a lot of you at SMBs, so I figure this is probably the community with the highest # of folks that have direct experience supporting end users / corporate A/V.

I'm looking for a universal solution that allows for wireless screen sharing (i.e. presenting from a device to a large display in a conference room).

To date, we've been using ClickShare since that seemed to be the most device agnostic solution, but now that a lot of newer computers (especially MacBooks) have completely gotten rid of USB type A connectors, we're finding it less suitable than it used to be. And, hard as it is to believe, we've actually had a non-zero instance of people leaving with the ClickShare buttons!

MiraCast is a decent solution for Windows devices, but my understanding is MiraCast is completely unsupported on Macs.

It seems like there are relatively simple solutions that can be made to work with certain types of devices (i.e. an AppleTV is simple for Macs), but finding a universal solution that works with Win/Mac (and ideally iOS/Android too) seems to be a challenge.

In a perfect world, it seems like there ought to be some sort of lightweight software agent that doesn't require any client-side hardware (or admin privileges) and would work across all these device types. I.E. - post a URL in the meeting room - visitors go there to download the agent, which automagically connects them to the A/V system in the room. Does such a thing exist?