I've seen a few WebRTC server implementations pop up recently but the only clients I have seen are web browsers. Does anyone know of any WebRTC client implementations apart from the browser? Or am I misunderstanding the WebRTC architecture completely?
At a low level, webrtc interoperates with VoIP. But because webrtc doesn't mandate a signalling protocol and VoIP uses SIP, generally you need a browser to run whatever proprietary signalling the site decided to implement in JS.
Anything can function as the signaling layer since all you need is to exchange pieces of text. I think the point was that most sites choose to implement it using JS and browser API's like ajax, websocket or SSE.
Because webrtc came from the chromium source code so you got it installed already on your browser. Then Google took it out there and made it stand alone library so you can use it on apps. I see webrtc projects occasionally here on Show HN threads