LiveSmart Video Chat is a standalone web application with video, audio, recording, screen sharing and file transfer face-to-face communication channels and integrated chat. It has own signaling server, based on Socket.io. It does not require any additional installations or third party logins and accounts. You can set a highly customizable contact button on your web site so that your visitors can directly call you if you are online.
Demo: https://codecanyon.net/item/livesmart-video-chat/23122332